OLED
Organic light-emitting diode TVs can turn off individual pixels for deep blacks and high contrast.
Why it matters when buying: Brightness in sunny rooms, burn-in risk for static content, and price tiers change whether OLED is the right lane.
Glossary
Product Buying Glossary
Plain-English definitions for terms you will see in Better Buy Lab guides. These are practical shopping context—not industry-standard certifications unless a guide says otherwise.
Mini LED
LCD TVs with many small backlight zones that improve contrast versus basic LED sets.
Why it matters when buying: Bright-room performance and blooming control vary by zone count and tuning—not by the label alone.
Refresh rate
How many times per second the display updates the image, measured in hertz (Hz).
Why it matters when buying: Games and motion clarity benefit from higher refresh when the GPU and cable path support it; office work may not need peak Hz.
Input lag
Delay between a controller or mouse action and the on-screen response.
Why it matters when buying: Competitive gaming cares about lag; movie watching is more forgiving. Marketing game modes still need real-device checks.
HDMI 2.1
A HDMI generation that can support higher bandwidth features such as 4K high refresh on compatible chains.
Why it matters when buying: Console and PC gamers should match TV or monitor ports, cables, and device output—version labels alone do not guarantee a feature works in your setup.
CADR
Clean Air Delivery Rate—an industry rating for how much filtered air a purifier moves for smoke, pollen, and dust classes.
Why it matters when buying: Undersized purifiers underperform in large rooms; CADR helps size planning alongside noise and filter upkeep.
HEPA filter
High-efficiency particulate air filters capture a high percentage of particles that pass through when maintained correctly.
Why it matters when buying: Filter replacement cost and sealed housing matter as much as the HEPA label—check upkeep before buying.
Dehumidifier capacity
How much moisture a dehumidifier can remove per day, often listed in pints or liters.
Why it matters when buying: Basements and damp rooms need realistic capacity plus drain or tank routines you will maintain.
Self-empty dock
A robot vacuum base that empties the onboard bin into a larger bag or bin.
Why it matters when buying: Reduces daily emptying but adds bag cost and noise—pet hair households should plan upkeep.
Cordless vacuum runtime
How long a battery stick vacuum runs per charge on a given mode.
Why it matters when buying: Marketing runtime often reflects eco modes; pet hair and carpets drain faster—plan for spare batteries if needed.
Mesh Wi-Fi
Multiple router nodes that share one network name to extend coverage.
Why it matters when buying: Helps dead zones but still needs thoughtful placement; wired backhaul improves busy homes.
Wi-Fi backhaul
How mesh nodes talk to each other—wireless repeat or wired ethernet between nodes.
Why it matters when buying: Wired backhaul usually beats wireless repeat in homes with many devices and thick walls.
VPN logging policy
Provider statements about what connection or account data they collect, retain, or share.
Why it matters when buying: Marketing “no logs” claims still need plain-language policy reading—Better Buy Lab does not certify providers.
ANC
Active noise canceling uses microphones and electronics to reduce outside noise at the ear.
Why it matters when buying: Fit and comfort change ANC satisfaction as much as marketing scores—try return policies when possible.
Soundbar channels
Speaker layouts such as 2.1 or 5.1.2 describe drivers and whether separate subs or height speakers are included.
Why it matters when buying: Room size and HDMI eARC needs matter more than channel marketing alone.
Laptop battery life
How long a laptop runs on battery under stated test conditions.
Why it matters when buying: Real campus or travel use varies with brightness and apps—treat claims as upper bounds, not guarantees.
Mechanical keyboard switch
Individual spring-loaded switches under each key with distinct feel and sound profiles.
Why it matters when buying: Linear, tactile, and clicky types affect noise and gaming feel—layout and desk noise matter first.
DPI
Dots per inch—how far the cursor moves on screen per inch of mouse movement.
Why it matters when buying: Very high DPI is not always better; in-game sensitivity and pad size shape aim more than peak numbers.
Mattress firmness
Subjective feel from soft to firm describing surface resistance and support.
Why it matters when buying: Side sleepers often want pressure relief; back sleepers may prefer firmer support—there is no universal firmness score.
Cooling mattress
Mattresses or toppers marketed for heat dissipation via materials or covers.
Why it matters when buying: Cooling claims vary; hot sleepers should pair expectations with room airflow and bedding, not marketing alone.
HDMI eARC
Enhanced Audio Return Channel passes high-bandwidth TV audio to a soundbar or receiver over one HDMI cable.
Why it matters when buying: Dialogue upgrades fail when TV and bar ports mismatch—verify eARC on both sides before chasing Atmos labels.
Throw ratio
How far a projector must sit from the screen to fill a target image width.
Why it matters when buying: Short-throw models reduce room depth needs but still require measured clearance—not every wall fits every inch goal.
Robot vacuum mapping
Navigation that builds a floor plan so the bot can split rooms and avoid repeat misses.
Why it matters when buying: Mapping helps schedules but does not fix thick rugs, cables, or thresholds—supervise first runs realistically.
Earbud fit
How securely tips and wings seal in the ear canal for stability, bass, and ANC performance.
Why it matters when buying: Poor fit causes drop-outs and weak ANC regardless of model tier—tip size and return policy matter first.
Bagged vacuum
Vacuums that collect debris in disposable bags, often sealed when removed from the machine.
Why it matters when buying: Can reduce dust exposure when emptying—trade ongoing bag cost against allergy-sensitive routines.
Chromebook
Laptops running Chrome OS, optimized for browser-first work with Google account sign-in.
Why it matters when buying: Fits school and light web workflows when software requirements confirm—Windows still wins for many native apps.
AV receiver
A hub that switches HDMI sources and powers separate speakers in a home theater stack.
Why it matters when buying: More flexible than soundbars for surround upgrades—needs space, wiring, and setup patience.
Ultrawide monitor
A wide-aspect display—often 21:9—that replaces dual monitors with one curved or flat panel.
Why it matters when buying: Desk depth, GPU output, and workflow matter more than width alone—some jobs still want dual screens.
Wi-Fi 7
A Wi-Fi generation that can add multi-link and throughput headroom on supported routers and clients.
Why it matters when buying: Placement, ISP speed, and client support often beat generation badges—Wi-Fi 6 remains enough for many homes.
Hybrid mattress
A mattress combining coil support with foam or latex comfort layers.
Why it matters when buying: Bounce and edge support differ from all-foam memory beds—side sleepers should still match firmness and trials.
Purifier room coverage
How well an air purifier’s smoke CADR matches room volume and desired air changes per hour.
Why it matters when buying: Marketing room sizes skip ceiling height and allergy targets—use CADR math before buying.
Short-throw projector
A projector designed to sit close to the screen and still fill the image width.
Why it matters when buying: Room depth and console placement matter—measure throw before buying long-throw habits in a small apartment.
Mac display scaling
How macOS sizes on-screen text and UI relative to monitor resolution and panel size.
Why it matters when buying: Sharp text on Mac often needs the right resolution and size combo—not peak refresh marketing alone.
Robot mop pad
A removable pad on mop-capable robots that wet-cleans hard floors during a scheduled pass.
Why it matters when buying: Pad washing and tank refills add upkeep vacuum-only bots skip—match floor mix before paying for mop lanes.
Hardwood floor vacuum
Vacuum setup tuned for bare floors—often soft rollers or brush shutoff—to reduce scratching and scatter.
Why it matters when buying: Mixed homes need carpet-capable pickup without damaging daily hardwood paths.
Mesh node placement
Where you put primary and satellite mesh units so backhaul and client coverage overlap where devices live.
Why it matters when buying: Bad placement recreates dead zones even on expensive kits—layout beats generation marketing.
Projector screen gain
How reflectively a screen returns light to viewers—higher gain can boost brightness but narrows viewing angles.
Why it matters when buying: Screen gain does not replace light control in bright rooms—pair with throw and seating plans.
Mattress trial period
The window a seller allows to test a mattress at home before return or exchange rules apply.
Why it matters when buying: Break-in nights, pickup fees, and donation rules vary—read policy before checkout, not after poor sleep.
Air fryer capacity
Basket volume and shape that determine how much food fits per batch—not just quart marketing on the box.
Why it matters when buying: Undersized baskets mean batch cooking; oversized units waste counter space for solo meals.
Keyboard layout
Physical key arrangement from full-size number pads to compact 60 percent boards with layer keys.
Why it matters when buying: Desk reach, arrow-key habits, and mouse space change more than switch brand names alone.
HEPA filter replacement
Scheduled swap of particle filters on air purifiers so CADR and airflow stay effective.
Why it matters when buying: Clogged filters raise noise and drop capture—plan genuine filter availability before buying the unit.
Basement humidity
Moisture levels in below-grade spaces often measured as relative humidity (RH) with seasonal swings.
Why it matters when buying: Musty basements need dehumidification or source fixes—purifiers alone do not remove moisture.
Viewing distance
Eye-level spacing from your seat to the TV screen—used to pick a comfortable diagonal size band.
Why it matters when buying: Oversized screens with soft sources look worse up close—measure distance before sale diagonals.
Monitor ergonomics
Desk setup habits—height, distance, and layout—that reduce neck and eye strain with external displays.
Why it matters when buying: Refresh and resolution matter less if the panel sits too low or too close on a shallow desk.
Gaming headset wireless
Console and PC wireless paths—USB dongles, platform-specific radios, or Bluetooth—for chat and game audio.
Why it matters when buying: Platform pairing rules differ; a PS5-first dongle may fail on Xbox without adapters.
Pet hair robot
Robot vacuums tuned for brush roll contact, suction, and bin upkeep on fur-heavy floors.
Why it matters when buying: Mapping badges do not replace brush cleaning on long-haired breeds or thick rugs.
Air fryer cleaning
Basket, tray, and element upkeep—including non-stick-safe tools and odor control after greasy batches.
Why it matters when buying: Coating damage and smoke smells show up when cleaning access does not match cooking habits.