The smart home industry loves jargon. Here are the 50+ terms you’ll actually run into, defined plainly. Bookmark this and refer back when a product page leaves you guessing.
Organized into ecosystems, networking, devices, and concepts. Use Ctrl+F (Cmd+F on Mac) to find a specific term.
Ecosystems and platforms
Apple Home / HomeKit — Apple’s smart home platform. The app is “Home” on iPhone/iPad. HomeKit was the original name; Apple Home is the newer term. Same thing.
Google Home — Google’s smart home platform. Works best with Android, Pixel, and Nest hardware. The app is also called “Google Home.”
Amazon Alexa — Amazon’s voice assistant + smart home platform. Lives in Echo speakers, Fire TVs, and many third-party devices.
SmartThings — Samsung’s smart home platform. Works on Galaxy phones and many compatible TVs.
Home Assistant — A free, open-source, self-hosted smart home platform. Powerful but requires you to set up your own server. For enthusiasts.
Read our Matter vs HomeKit vs Google Home guide to pick one.
Connectivity standards
Wi-Fi — Your home internet network. Most cheap smart home devices use 2.4 GHz Wi-Fi (longer range, lower bandwidth) and not the faster 5 GHz Wi-Fi.
Bluetooth — Short-range (typically 30 ft) wireless used for setup or for nearby devices like smart locks. Higher security but limited range.
Zigbee — A low-power mesh wireless standard used by Hue lights, many Aqara sensors, and SmartThings devices. Requires a hub.
Z-Wave — Another low-power mesh standard, popular for security devices and smart locks. Requires a hub. Different frequency from Zigbee, so they don’t interfere.
Thread — A newer low-power mesh wireless standard built for Matter. Requires a Thread border router (like a HomePod mini, Nest Hub, or Echo).
Matter — A universal device language that runs over Wi-Fi or Thread. Lets devices from any brand work with HomeKit, Google Home, and Alexa. See our What Is Matter guide.
BLE (Bluetooth Low Energy) — A version of Bluetooth optimized for tiny battery-powered devices like sensors. Used for Hue’s bridgeless setup and Apple’s Find My network.
Hardware terms
Hub / Bridge — A small box that connects non-Wi-Fi smart devices (Zigbee, Z-Wave, Thread) to your home network. Examples: Hue Bridge, Aqara Hub, SmartThings Hub.
Smart speaker — A speaker with a built-in voice assistant. Echo Pop, Nest Mini, HomePod mini.
Smart display — A smart speaker with a screen. Echo Show 8, Nest Hub Max.
Smart bulb — A light bulb with built-in Wi-Fi or Zigbee that you control from an app or voice. See our best smart bulbs guide.
Smart switch — Replaces the wall switch itself. Better than smart bulbs if multiple bulbs are on one circuit. Works with regular bulbs.
Smart plug — Plugs into a wall outlet; you plug a regular device into it. Makes any plug-in appliance app-controllable.
Smart lock — Replaces or augments your existing deadbolt. Lets you unlock from your phone, give one-time codes to guests, or unlock when your phone arrives home.
Smart thermostat — Replaces your existing wall thermostat. Learns your schedule, controllable from your phone, often saves $50–$200/year on heating/cooling.
Smart doorbell — A camera doorbell. Lets you see/talk to whoever’s at the door from your phone.
Networking concepts
Mesh network — A network where every device helps relay signal to other devices. Improves reliability and range. Mesh is used by Zigbee, Z-Wave, Thread, and most modern Wi-Fi mesh systems (eero, Orbi, Google Wifi).
Local control — A device that works without internet (still responds to voice/phone on the same Wi-Fi). Better for privacy and reliability. Most Hue, HomeKit, and Matter devices have this.
Cloud control — A device that requires sending commands through the manufacturer’s servers, even from inside your home. Slower, breaks during outages.
2.4 GHz / 5 GHz — Two Wi-Fi bands. 2.4 GHz has longer range and goes through walls better but is slower. Most smart home devices ONLY use 2.4 GHz.
IoT (Internet of Things) — The umbrella term for all internet-connected devices in your home. “Smart home” is a subset of IoT.
Features and concepts
Geofencing — A virtual boundary around your home. Triggers automations when your phone arrives or leaves (e.g., turn off thermostat when leaving).
Routine / Scene / Automation — A series of actions triggered by one command, time, or event. See our Alexa Routines guide.
Voice control — Controlling devices by speaking to a smart speaker.
Skill / Action — A third-party integration in Alexa (Skill) or Google Assistant (Action). E.g., the “Wyze Skill” lets Alexa control Wyze cameras.
Multi-admin — A Matter feature where one device can be controlled by multiple platforms (Apple + Google + Alexa) simultaneously.
Schedule — A time-based automation (e.g., porch light at sunset).
Trigger — The event that starts an automation (voice, time, motion, etc.).
Action — What the automation does once triggered.
Group — A bundle of devices controlled together. “Living room lights” might be a group of 3 bulbs.
Scene — A specific configuration of devices. “Movie night” might be lights at 20%, TV on, thermostat at 68°.
Security and privacy
End-to-end encryption — Data is encrypted between your device and the smart home platform; the cloud provider can’t read it. HomeKit uses this. Some Ring/Nest features do too.
Two-factor authentication (2FA) — A second login step (a code from your phone) to protect your smart home account. Always enable this.
Local processing / On-device AI — Features that run on the device itself, not in the cloud. Better for privacy. Apple Home and newer Eufy cameras do this.
Cloud storage — Recordings or data stored on the manufacturer’s servers. Convenient but raises privacy questions.
Firmware — Software running on the device. Update it regularly for security fixes.
Energy and electrical
Phantom power / Vampire load — Electricity drawn by devices that are “off.” See our smart plug energy savings guide.
kWh (kilowatt-hour) — The unit your electric bill uses. 1,000 watts running for 1 hour. US average price: ~$0.15/kWh.
C-wire — A wire in some thermostat installs that provides constant 24V power. Required by most smart thermostats.
Line voltage / High voltage — 120V/240V electrical. Used by electric baseboard heaters; requires special smart thermostats.
PoE (Power over Ethernet) — A single Ethernet cable that carries both data and power. Used by some security cameras for one-cable installs.
Common abbreviations
HK — HomeKit
SS — SmartThings
HA — Home Assistant (the open-source platform)
FOSS — Free and open-source software
RTSP — A video streaming protocol used by some cameras
NVR — Network Video Recorder; a device for storing camera recordings
API — Application Programming Interface; how developers integrate with smart home platforms
Bottom line
Bookmark this page. The smart home industry will keep inventing new buzzwords, but most of them are just packaging for the concepts above. If you understand Matter, Thread, hubs, and the difference between local and cloud control, you can decode any smart home product page in a minute.
For deeper dives, start with What Is a Smart Home? if you’re brand new, or Matter vs HomeKit vs Google Home if you’re picking a platform.
— Written by The Grid editorial team.
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