Glossary
Plain-English spec dictionary
Every spec we measure, defined without marketing fluff.
120 terms catalogued
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A
- Active noise cancellationSee [Active noise cancellation](/glossary/active-noise-cancellation).
- Active noise cancellation (ANC)A technology that uses microphones and a real-time inverse audio signal to cancel out ambient noise in headphones and earbuds. Most effective on low-frequency, steady-state noise like engine rumble or HVAC hum.
- Adobe RGBA color space designed for print prepress, with wider green/cyan coverage than sRGB. Important for photographers proofing for CMYK output; less useful for video or web work.
- AF pointsThe number of selectable autofocus zones across the frame. More points usually means denser frame coverage and finer subject-tracking granularity.
- AMOLEDActive-Matrix Organic Light-Emitting Diode — the most common OLED variant in smartphones. Each pixel is individually driven by a thin-film transistor, enabling fast switching and rich color.
- Anti-glare coatingA matte or micro-etched layer applied to a display surface to scatter reflected light. Reduces mirror-like reflections at the cost of slight contrast and sharpness loss.
- AnTuTuA widely-cited cross-platform smartphone benchmark that combines CPU, GPU, memory, and UX tests into a single composite score. Useful as a rough ranking, less so for granular comparison.
- ApertureThe lens opening that admits light, expressed as f-number (e.g., f/1.4, f/2.8). Lower f-number = wider opening = more light + shallower depth of field.
- aptX HDQualcomm's Bluetooth audio codec, streaming up to 576 kbps. Lower bitrate than LDAC but lower latency and broader Android device support.
- ARM vs x86Two competing CPU instruction-set architectures. x86 (Intel, AMD) dominates desktop and server; ARM (Apple Silicon, Snapdragon, Ampere) dominates mobile and is now serious in laptops and servers.
- Aspect ratioThe ratio of a display's width to its height. 16:9 is the consumer baseline; 21:9 (ultrawide) and 32:9 (super-ultrawide) trade vertical space for horizontal canvas.
- AV1A royalty-free video codec from the Alliance for Open Media. ~30% more efficient than H.265/HEVC at the same quality. Hardware-decoded on most 2022+ devices; encoding still GPU-accelerated rather than universal.
B
- Battery cyclesOne full discharge-charge cycle. Lithium-ion batteries degrade with each cycle; modern cells retain 80% of original capacity after 500–1,000 cycles in normal use.
- Bit depth (audio)The number of bits used to represent each audio sample. 16-bit covers consumer use (CD quality); 24-bit is the studio standard, giving more dynamic range and quieter noise floor.
- Black Frame Insertion (BFI)A display technique that inserts black frames between rendered frames to reduce motion blur on sample-and-hold panels (LCD, OLED). Improves perceived motion clarity at the cost of brightness and flicker.
- Bluetooth 5.3 / 5.4The current generations of Bluetooth, refining the 5.x baseline with lower power, better channel classification, and support for LE Audio. The wireless standard for personal-area devices in 2026.
- Bluetooth LE AudioA new generation of Bluetooth audio built on Bluetooth Low Energy. Introduces the LC3 codec, broadcast audio (Auracast), and better hearing-aid support.
C
- CacheSmall, fast memory inside a CPU that stores recently-used data and instructions. L1 is fastest and smallest; L3 is largest and shared across cores. Cache size meaningfully impacts gaming and database workloads.
- Cinebench R23A cross-platform CPU benchmark from Maxon that renders a 3D scene using the Cinema 4D engine. Reports a single-core and a multi-core score; widely used to compare sustained CPU performance.
- Color accuracyHow closely a display's output matches the intended reference colors, measured as Delta-E. Lower is better; ΔE under 2 is generally indistinguishable from reference for trained eyes.
- Color gamutThe range of colors a display can reproduce, usually expressed as a percentage of coverage of a standard color space — sRGB (web), DCI-P3 (cinema), Adobe RGB (print), or Rec. 2020 (HDR).
- Computational photographyTechniques that combine multiple frames, sensor data, and machine learning to produce images beyond what a single exposure could capture. The reason a 1/2.5-inch phone sensor can rival a full-frame camera on social media.
- CPU socketThe mechanical and electrical interface that connects a desktop CPU to its motherboard. Determines which CPUs are compatible. Examples: AM5 (AMD Ryzen 7000/9000), LGA 1851 (Intel Core Ultra Series 2).
- CUDA coresNVIDIA's parallel shader processors. Each CUDA core executes one floating-point or integer operation per clock; total count is a rough indicator of raster throughput within a generation.
- Curve radiusThe radius (in mm) of the imaginary circle that a curved monitor's panel would form if extended. 1000R is the tightest; 1500R / 1800R are gentler. Lower number = more curve.
D
- DCI-P3A wide-gamut color space defined by the Digital Cinema Initiatives. Covers about 25% more color volume than sRGB and is the de facto target for HDR mastering and modern video work.
- DDR5The current generation of system memory (DRAM). Higher bandwidth and lower voltage than DDR4. Standard in laptops since 2023 and desktops since 2022.
- Delta-EA numeric measurement of color difference between a target color and a measured color. ΔE < 1 is calibration-grade; ΔE < 2 is invisible to most viewers; ΔE > 4 is visible to anyone.
- DLSSDeep Learning Super Sampling — NVIDIA's AI-based upscaler that renders games at a lower internal resolution and reconstructs them to a higher output, recovering performance with minimal visible quality loss.
- Dolby AtmosAn object-based surround sound format that adds height channels, letting individual sounds be placed and moved anywhere in a 3D space rather than fixed to specific speakers.
- Dolby VisionA proprietary HDR format from Dolby that uses dynamic metadata and a 12-bit color path to tone-map each scene (or frame) individually. The most demanding HDR target a TV can support.
- DRAM cacheA small DDR memory chip on an SSD that stores the flash translation layer (FTL) map. Drives with DRAM have predictable random-access performance; DRAM-less drives degrade under heavy use.
- Dual card slotsA camera body with two memory card slots. Enables in-camera backup writing, overflow recording, or splitting RAW and JPEG between cards. A defining feature of professional bodies.
- Dual Pixel CMOS AFCanon's implementation of on-sensor phase-detect AF. Every imaging photosite is split into two photodiodes, giving 100% frame coverage with no AF-pixel gaps in the image.
- Dynamic driverThe most common headphone/earbud driver type. A voice coil in a magnetic gap moves a diaphragm to produce sound. Inexpensive, robust, and good at bass.
E
- Endurance (TBW)Total Bytes Written — the cumulative write volume an SSD is rated to survive under warranty. A 1 TB consumer drive typically rates 600–1,200 TBW.
- Eye-detection AFAn autofocus mode that finds and tracks the subject's eye specifically. The defining feature of modern mirrorless portrait and event shooting.
F
- Fast chargingA class of charging technologies that deliver high wattage (45–300 W) to refill a phone battery much faster than the 5–20 W of legacy USB. Requires both compatible charger and device.
- Fast charging (watts)The peak wattage a device accepts while charging. Higher numbers mean faster top-ups, but real-world charge time depends on the curve, not just the peak.
- FreeSyncAMD's variable refresh rate technology, built on VESA Adaptive-Sync. Royalty-free, broadly supported on both AMD and (increasingly) NVIDIA hardware.
- Frequency responseThe range and balance of audio frequencies a driver or speaker can reproduce, measured in Hz. A flat response from 20 Hz–20 kHz is the studio-monitor ideal.
- FSRFidelityFX Super Resolution — AMD's upscaling technology, open-source and cross-vendor. FSR 4 brings machine-learning upscaling competitive with DLSS on supported hardware.
G
- G-SyncNVIDIA's variable refresh rate technology. The original implementation required a proprietary scaler module in the monitor; G-Sync Compatible is the open VESA Adaptive-Sync version.
- GaN chargerA charger built around gallium nitride (GaN) transistors instead of silicon. GaN switches faster and runs cooler, allowing chargers to be half the size and weight at the same wattage.
- GeekbenchA cross-platform CPU benchmark with separate single-core and multi-core scores. The most widely-quoted CPU benchmark for desktop, laptop, and smartphone comparison.
H
- HDMI 2.1The current consumer-grade HDMI standard, capable of 48 Gbps bandwidth — enough for 4K at 120 Hz, 8K at 60 Hz, VRR, ALLM, and eARC.
- HDRHigh Dynamic Range — a display capability that delivers a wider range of brightness and color than traditional SDR (standard dynamic range). Formats include HDR10, HDR10+, Dolby Vision, and HLG.
- HDR10+An open, royalty-free HDR format developed by Samsung and Amazon that adds dynamic metadata to HDR10. Functionally similar to Dolby Vision but without licensing fees.
- Hyperthreading / SMTSimultaneous Multithreading — one physical CPU core presenting itself as two logical threads, sharing execution units to keep them busy when one thread stalls.
I
- IBISIn-Body Image Stabilization — the camera body itself moves the sensor to counter hand shake. Works with any lens, including unstabilized primes and adapted vintage glass.
- ImpedanceA headphone's electrical resistance to AC current, in ohms (Ω). Low-impedance (16–80 Ω) headphones run loud from any phone; high-impedance (250–600 Ω) need a dedicated amplifier.
- Integrated graphics (iGPU)A GPU built into the same silicon as the CPU, sharing system memory instead of using dedicated VRAM. Sufficient for productivity, light gaming, and video; not for AAA gaming at high settings.
- IP ratingAn international standard (IEC 60529) that describes how well an enclosure resists solid particles and water. Two digits: first for dust, second for water. IP68 phones, for example, are dust-tight and survive immersion up to a defined depth.
L
- LDACSony's high-bitrate Bluetooth audio codec, capable of 990 kbps streaming — close to lossless quality. Supported by most modern Android devices and high-end Sony / non-Sony headphones.
- LidarLight Detection and Ranging — a sensor that measures distance by timing how long laser pulses take to bounce off surfaces. Used in robot vacuums, AR headsets, smartphones, and self-driving systems.
- Local dimmingAn LCD backlight technique where independent zones can dim or brighten separately, deepening blacks and lifting HDR highlights. Implemented in edge-lit, full-array (FALD), and Mini-LED forms.
- Log profileA video gamma curve that records a wider dynamic range than standard Rec. 709, requiring color grading in post-production. Standards include S-Log3 (Sony), C-Log (Canon), N-Log (Nikon), V-Log (Panasonic).
- Lossless audioAudio compression that preserves every bit of the original master, in contrast to lossy formats (MP3, AAC, Ogg) that discard inaudible data to save space.
- Lossless streamingAudio streaming that delivers bit-perfect copies of master files rather than lossy MP3 / AAC compression. Tidal HiFi, Apple Music, Amazon Music HD, and Qobuz all offer lossless tiers.
M
- M.2 slotA small board-edge connector for NVMe SSDs (and some Wi-Fi cards). Sizes are denoted by length — 2280 is the desktop standard, 2230 fits the Steam Deck and ROG Ally.
- MagSafeApple's magnetic wireless-charging system for iPhone. Aligns coils for higher efficiency and supports 15 W charging. The Qi2 standard adopts the same magnet ring for cross-brand compatibility.
- MatterA royalty-free smart-home interoperability standard developed by Apple, Google, Amazon, and the Connectivity Standards Alliance. Lets devices from different ecosystems work together over IP.
- Mesh networkA Wi-Fi system built from multiple coordinated nodes (a router plus satellites) that share one SSID and seamlessly hand off clients between them. The standard fix for large or multi-floor homes.
- Mini-LEDAn LCD backlight technology that uses thousands of tiny LEDs in local-dimming zones to approximate per-pixel control, delivering high HDR brightness without OLED burn-in risk.
- MU-MIMOMulti-User Multiple-Input Multiple-Output — a Wi-Fi feature that lets a router serve several clients on the same channel simultaneously instead of round-robin, improving aggregate throughput.
- Multipoint pairingA Bluetooth feature that lets one set of headphones stay simultaneously connected to two source devices (typically a phone and a laptop), switching audio based on which device is playing.
N
- NPUNeural Processing Unit — a dedicated co-processor optimized for the matrix math of neural network inference. Found in modern smartphone SoCs, laptop CPUs, and Copilot+ PCs.
- NVMe SSDA solid-state drive that connects directly to the CPU via PCIe lanes using the NVMe protocol. Far faster than SATA SSDs (3–14 GB/s vs 0.55 GB/s sequential).
O
- OLEDOrganic Light Emitting Diode — a display technology where each pixel emits its own light, enabling true blacks, per-pixel contrast, and very fast response times.
- Optical image stabilizationA camera feature that physically shifts the lens (or sensor) to counteract hand shake, enabling longer exposures and steadier video.
- OverclockingPushing a CPU, GPU, or memory above its rated clock speed for extra performance. Possible on most desktop CPUs/GPUs and on "K" / "X" / "XT" SKUs; uncommon on laptops.
P
- PCIe 5.0The fifth generation of the PCI Express bus. Doubles per-lane bandwidth over PCIe 4.0 to about 4 GB/s. Used for the latest NVMe SSDs and the GPU slot on AM5 / LGA 1700+ motherboards.
- Phase-detect autofocusAn AF method that measures the displacement between two sub-images to compute focus distance in one step — fast and predictive, ideal for moving subjects.
- Pixel binningA sensor mode that combines 2×2 (quad bayer) or 3×3 (nona-binning) adjacent pixels into one virtual pixel, trading resolution for low-light sensitivity. The reason 200 MP phone sensors usually output 12.5 MP photos.
- Pixel density (PPI)Pixels per inch — how many physical pixels fit in one inch of display. Higher PPI means finer detail and less visible pixel structure at a given viewing distance.
- Planar magneticA headphone driver that uses a thin diaphragm with an embedded conductor sandwiched between magnet arrays. Lower distortion and faster transients than dynamic drivers; heavier and pricier.
- Process nodeThe semiconductor manufacturing generation used to fabricate a chip. Smaller nominal numbers (3nm, 2nm) generally mean better power efficiency and density — but the marketing names no longer map to physical gate length.
- ProResApple's professional video codec, designed for editing rather than delivery. Higher bitrate and quality than H.264/H.265 at the same resolution; massive file sizes. Variants from ProRes Proxy through ProRes 4444 XQ.
- PSU wattageThe maximum continuous power output a desktop power supply unit can deliver, in watts. A correctly sized PSU runs efficiently and quietly; an undersized one shuts down under load.
- PWM flickerPulse-Width Modulation flicker — a brightness-control technique that rapidly cycles the backlight or OLED on and off. At low frequencies, sensitive viewers perceive flicker; eyestrain and headaches can result.
Q
- QLC NANDQuad-Level Cell flash memory — stores 4 bits per cell. Cheapest mainstream NAND, lower endurance and slower sustained writes than TLC.
- QLEDQuantum-dot LED — an LCD panel whose backlight passes through a quantum-dot film that converts blue light into pure red and green, widening color gamut. QLED is still LCD; not to be confused with OLED.
- Quantum dotNanoscale semiconductor crystals (2–10 nm) that emit a single, precise wavelength of light when energized. Used as a color-conversion layer in QLED and QD-OLED displays.
R
- RAWAn unprocessed image file format that preserves the sensor's full data. Compared to JPEG, RAW gives far greater flexibility in post-processing — exposure, white balance, and shadows can be recovered without quality loss.
- Ray tracingA rendering technique that simulates the physical paths of light rays, producing realistic reflections, refractions, and shadows. Hardware-accelerated on RTX (NVIDIA), RDNA 2+ (AMD), and Arc (Intel) GPUs.
- Rec. 2020The ultra-wide color space defined for UHD TV and HDR. Covers about 76% of the visible color spectrum — far wider than DCI-P3 (54%) or sRGB (35%). No 2026 consumer display covers 100%.
- Refresh rateHow many times per second a display redraws the image on screen, measured in Hertz (Hz). Higher numbers mean smoother motion and lower perceived input latency.
- Response timeHow long a pixel takes to transition from one color to another, measured in milliseconds. Lower is better — slow response causes motion blur and ghosting on fast-moving content.
- Rolling shutterAn artifact of CMOS sensors that read pixels row-by-row from top to bottom. Fast-moving subjects appear sheared; flashes appear as bands. Affects most mirrorless and phone cameras.
S
- SensitivityHow loud a headphone or speaker plays at a given input power, expressed in dB/mW (headphones) or dB/W (speakers). Higher sensitivity = louder at lower power.
- Sensor sizeThe physical area of a camera's image sensor. Larger sensors gather more light, deliver less noise, shallower depth of field, and better low-light performance. The single biggest determinant of image quality.
- Single-core vs multi-coreTwo complementary measures of CPU performance. Single-core predicts UI snappiness and single-threaded apps; multi-core predicts compile, render, and batch workloads.
- SoundstageThe perceived spatial size and depth of a stereo recording when played through headphones or speakers. Wide soundstage spreads instruments left/right and front/back; narrow soundstage sounds compressed inside the head.
- Spatial audioAn immersive audio format that places sound objects in a 3D space around the listener. Includes Dolby Atmos, Apple Spatial Audio, and Sony 360 Reality Audio.
- sRGBThe baseline color space for the web, Windows, and most consumer content. Defined in 1996; covers a narrower volume than DCI-P3 or Adobe RGB. Still the default everything-else.
T
- TDPThermal Design Power — the maximum sustained heat output a CPU or GPU is designed to dissipate, measured in watts. A guide for cooler sizing, not an absolute power consumption number.
- Tensor coresSpecialized matrix-multiply units on NVIDIA RTX GPUs, optimized for the half-precision math used in deep learning. Power DLSS, frame generation, and on-device AI inference.
- THDTotal Harmonic Distortion — the percentage of a reproduced audio signal that is unwanted harmonic content. Lower is better. Hi-Fi targets THD < 0.1%; cheap drivers run 1–5%.
- Thermal throttlingAutomatic clock-speed reduction when a CPU or GPU hits its thermal limit. Protects silicon from damage but cuts performance — often the single biggest gap between spec-sheet and real-world results.
- ThreadA low-power, IPv6-based mesh networking protocol for smart-home devices. Underpins much of Matter; provides reliable connectivity for battery-powered sensors and locks.
- ThunderboltA high-speed I/O standard (Thunderbolt 4: 40 Gbps; Thunderbolt 5: 80–120 Gbps) carried over USB-C connectors. Supports DisplayPort, PCIe, USB, and power delivery on a single cable.
- Thunderbolt 4Intel's high-bandwidth interconnect over USB-C. Provides 40 Gbps bidirectional, 100 W power delivery, daisy-chained dual 4K display support, and PCIe 3.0 ×4 tunneling. Standard on premium laptops.
- TLC NANDTriple-Level Cell flash memory — stores 3 bits per cell. The mainstream choice for SSDs: balances cost, speed, and endurance.
- TOPSTera-Operations Per Second — a marketing-friendly metric for AI accelerator throughput. Higher is better, but the operation precision (INT8, FP16, FP4) and sparsity assumptions matter as much as the number.
- Turbo Boost / Precision BoostA CPU feature that opportunistically raises clock speed above the base clock when thermal and power budgets allow. Intel calls it Turbo Boost; AMD calls it Precision Boost.
U
- Ultra-wideband (UWB)A short-range radio technology that measures position with centimeter precision by timing pulses across a wide frequency spectrum. Used for AirTag-class trackers, car-as-key, and spatial computing.
- UndervoltingLowering a CPU or GPU's operating voltage below the factory default. Reduces heat and power draw, often allowing higher sustained clocks — the rare "free lunch" tweak.
- USB Power Delivery (USB-PD)An open standard for negotiating high-wattage charging over USB-C. PD 3.0 covers 5–100 W; PD 3.1 EPR extends to 240 W. The universal alternative to proprietary fast-charge protocols.
V
- VRAMVideo memory on a GPU, used to store textures, framebuffers, geometry, and ray-tracing acceleration structures. Insufficient VRAM causes texture pop-in, stutter, and outright crashes in modern games.
- VRRVariable Refresh Rate — a display feature that lets the panel's refresh rate match the source's framerate moment-by-moment, eliminating screen tearing and reducing stutter.
W
- Watt-hour (Wh)A unit of energy capacity. A 100 Wh battery delivers 100 watts for one hour, 50 watts for two, etc. The canonical spec for laptop and power-station batteries; airlines cap carry-on at 100 Wh.
- Weather sealingGaskets and seals on a camera body and lens that resist dust and light moisture. Not waterproofing — weather-sealed gear survives rain and dust, not submersion.
- Wi-Fi 6EWi-Fi 6 extended to the 6 GHz band. Same protocol as Wi-Fi 6 but with access to 1,200 MHz of additional spectrum, eliminating congestion in dense environments.
- Wi-Fi 7The latest Wi-Fi standard (802.11be), introducing 320 MHz channels, 4096-QAM modulation, and Multi-Link Operation. Theoretical peak: ~46 Gbps.
- Wi-Fi 7 Multi-Link OperationA Wi-Fi 7 feature that lets a client transmit and receive on two or three frequency bands (2.4 / 5 / 6 GHz) simultaneously. Reduces latency and improves reliability vs single-link Wi-Fi 6E.
- Wireless chargingCharging a device via electromagnetic induction from a charging pad, without a cable. Qi is the dominant open standard; MagSafe (Apple) and Qi2 add magnet alignment.