Smart home glossary.
Everyday explanations.

What is a smart home automation?

A rule that responds to a trigger, checks any required conditions and requests an action. Its usefulness depends on both the rule and the devices it can reach. An automation can activate a saved scene.

In a home: After sunset, a hallway sensor requests a gentle light only during agreed hours.

Compare scenes and automations → · Home Assistant: automation building blocks

What is a smart home bridge?

A connection between supported systems. In Matter, a compatible bridge can expose supported accessories from another technology. It does not give those accessories a new radio or guarantee that every feature transfers.

In a home: A supported lighting bridge may present existing lights to a Matter ecosystem.

Compare a hub, bridge and gateway → · Connectivity Standards Alliance: Matter FAQ

What does cloud control mean for a smart home?

Control that depends on a service outside the home. A command or rule may travel through a provider’s servers. Whether internet loss affects a particular action depends on the complete control path.

In a home: A working Wi-Fi signal does not prove an app can reach its required online service.

Explore internet and power failures → · Google Home: local Matter control and hub roles

What is the difference between a trigger and a condition?

A condition is a check that must pass before an automation continues. It is different from the event that starts the evaluation. Conditions can constrain when an otherwise useful routine should run.

In a home: Motion starts the check; “after sunset” decides whether the lamp should respond.

See trigger, condition and action examples → · Home Assistant: automation building blocks

What is a door or window contact sensor?

A sensor that reports an open or closed state, often using two parts whose separation is detected. Its report describes that contact point; it does not identify who moved it or whether a room is occupied.

In a home: A cupboard contact can report an opening without recording a video.

Explore access planning → · Aqara: door and window contact sensing

What is a Matter controller?

The part of a compatible system that commissions and controls supported Matter accessories. A product may combine this role with other jobs. Controller support and a Thread radio are separate questions.

In a home: Confirm both the ecosystem’s accessory support and any required Thread border router.

Identify the network and control roles → · Connectivity Standards Alliance: Matter FAQ

Is a smart home gateway the same as a hub?

Gateway is a broad product term for connecting networks or services. It does not promise one particular radio, automation engine or offline capability. Read the exact model’s functions rather than treating the name as a specification.

In a home: Ask which accessories it connects and where their rules execute.

Understand gateway versus hub → · Thread Group: border routers, hubs and bridges

What does a home energy monitor measure?

A device or system that reports electrical usage. Whole-home totals, circuit readings and plug measurements answer different questions. A monitor’s dashboard should not be assumed to replace the utility’s billing measurement.

In a home: An overnight total can reveal a pattern without identifying every appliance.

Choose an energy monitor by its purpose → · Hydro One: units in energy monitoring

What is a smart home hub?

A product that brings one or more smart-home functions together. It may connect accessories, run rules or provide a link to an app. The word alone does not establish Zigbee, Thread, Matter or local operation.

In a home: For a Zigbee smart home hub, check the supported devices and features before buying.

Learn what a smart home hub actually does → · Thread Group: border routers, hubs and bridges

What is a smart home integration?

A way for a platform to work with another device or service. Supported functions can vary between integrations, even for the same product. Check the particular measurement or action you need.

In a home: A light may support brightness in one app while offering additional effects in its own app.

Check ecosystem compatibility → · Connectivity Standards Alliance: Matter FAQ

What does kelvin mean for smart lighting?

The unit used to describe the appearance of white light. Lower colour temperatures look warmer and higher ones look cooler. Kelvin describes white tone, while lumens describe light output.

In a home: Compare the same lamp’s warm evening setting with a cooler task setting.

Compare warm and cool white lighting → · Philips Hue: colour temperature in kelvin

What is the difference between kW and kWh?

A kilowatt is a unit of power: the rate at which energy is being used or supplied. One kilowatt is 1,000 watts. It is different from the energy accumulated over a period.

In a home: A hypothetical steady 0.8 kW load running for three hours uses 2.4 kWh.

Understand power and energy readings → · Hydro One: units in energy monitoring

What does a kilowatt-hour measure?

Energy used or supplied over time. A kilowatt-hour represents one kilowatt sustained for one hour. Battery energy capacity and electricity consumption can use this unit, but real battery runtime also depends on losses and output limits.

In a home: A 1.2 kW example load for two hours uses 2.4 kWh before any additional assumptions.

Plan battery energy and loads → · Hydro One: units in energy monitoring

What is smart home latency?

The delay between an event or command and its observed result. Sensor reporting, the controller, networking and the device itself can all contribute. A fast radio alone does not establish a fast complete routine.

In a home: Test a hallway light by walking the normal route and observing when it responds.

Plan reliability and response → · Thread Group: border routers, hubs and bridges

What does a line-voltage thermostat mean?

A thermostat category used with certain mains-powered heating systems, including many electric baseboards. It is not interchangeable with a typical low-voltage furnace control. Exact heating type and model requirements need confirmation.

In a home: Identify the heating equipment before comparing app features; do not infer compatibility from appearance.

Check baseboard thermostat compatibility → · Mysa: thermostat compatibility checker

Does local control mean no internet is needed?

A control path that can operate within the home’s network. That does not establish that setup, remote access, voice processing or every automation also works offline. Evaluate each required function separately.

In a home: A local button routine may work while an away-from-home notification is unavailable.

Plan for internet outages → · Google Home: local Matter control and hub roles

What are lumens on a smart bulb?

A measure of light output. Lumens help compare brightness; watts describe electrical power. Adjustable colour and dimming settings can change the output, so compare the stated conditions as well as the headline value.

In a home: Choose enough usable light for a reading task before choosing decorative colours.

Plan useful room lighting → · Philips Hue: lumens and bulb brightness

What is Matter in a smart home?

A smart-home interoperability standard covering supported device communication and functions. Matter is not a radio. A Matter accessory can use a supported network transport such as Wi-Fi or Thread.

In a home: A Matter logo does not by itself tell you whether a Thread border router is needed.

Compare Matter and Thread → · Connectivity Standards Alliance: Matter FAQ

What is a mesh network for smart home devices?

A network arrangement in which suitable participating devices can relay traffic. Relay roles depend on the technology and product; do not assume that every battery sensor extends the network.

In a home: A powered network device may help a path, but a final-room test still matters.

Plan wireless coverage → · Connectivity Standards Alliance: Zigbee

What is an mmWave presence sensor?

A sensor using millimetre-wave radio sensing to detect movement, potentially including much smaller movements than a conventional PIR sensor. Sensitivity, room boundaries and placement affect the result. Product capabilities differ.

In a home: A seated reader may be detected without making a large arm movement.

Compare mmWave and PIR sensing → · Aqara: FP2 presence-sensing technology and limitations

What is an occupancy sensor compared with a vacancy sensor?

In lighting controls, occupancy mode commonly means automatic-on and automatic-off. The term describes control behaviour and does not identify a single sensing technology. Product settings determine the exact response.

In a home: A utility-room light can turn on after detection and turn off after an agreed timeout.

Compare occupancy and vacancy modes → · Lutron: occupancy and vacancy sensor modes

What does PIR mean on a motion sensor?

Passive infrared. A PIR motion sensor responds to changes in infrared energy across its sensing zones. It is useful for movement detection but can miss a person remaining relatively still.

In a home: Crossing a hall is a different sensing task from sitting at a desk.

Choose motion or presence sensing → · Lutron: occupancy and vacancy sensor modes

What is a human presence sensor?

A sensor intended to report whether someone is present. Some use mmWave radar; others use different or combined technologies. The label alone does not establish accuracy, zones, power requirements or privacy behaviour.

In a home: For a desk, test a quietly seated person as well as someone entering the room.

Choose a presence sensor for the room → · Aqara: FP2 presence-sensing technology and limitations

Is a smart home routine the same as an automation?

An app-specific label for grouped actions, rules or both. Platforms use the word differently. Separate what starts it, what it checks and what it changes before assuming two apps behave alike.

In a home: An “Evening” routine might be manually started, scheduled or activated by another rule.

Compare scenes, routines and automations → · Home Assistant: automation building blocks

What is a smart home scene?

A saved set of desired device states. A scene describes the result you want, while an automation can decide when to request it. How unsupported or unreachable devices are handled depends on the platform.

In a home: A reading scene might set two lamps to chosen brightness levels.

Understand scenes versus automations → · Home Assistant: scenes

How is a schedule different from an automation?

A plan based on time or recurring periods. It can be implemented through automation rules. Scheduling does not necessarily prove anyone is home or that a room is comfortable.

In a home: A weekday heating schedule still needs a usable override when plans change.

Choose a scene, schedule or rule → · Home Assistant: triggers

What is a script in home automation?

A reusable sequence of actions, potentially including waits or decision steps. In platforms that distinguish these concepts, a script describes a process rather than only a saved end state. Exact terminology varies.

In a home: A demonstration routine might announce a reminder, wait, then change a non-critical light.

Compare scripts and scenes → · Home Assistant: scripts and action sequences

What does thermostat setpoint mean?

The requested target temperature, rather than the current measured room temperature. Whether and when the equipment reaches it depends on the building, heating system and control behaviour.

In a home: A 21°C target and a 19.5°C room reading describe different things.

Plan thermostat targets and schedules → · Mysa: thermostat compatibility checker

What is a smart plug used for?

A plug-in control for a compatible appliance. Features can include remote switching, schedules or energy measurement, but not every model offers all of them. Appliance suitability and the plug’s ratings matter.

In a home: A suitable table lamp is a different load from equipment that must remain continuously powered.

Compare plug-level and whole-home monitoring → · Eve: smart plug control and energy measurements

What is Thread versus Wi-Fi or Matter?

An IP-based low-power mesh networking technology used by compatible accessories. Thread carries traffic; it does not by itself supply an app’s device-control features. Matter and Thread perform different roles.

In a home: Check both the accessory’s transport and the ecosystem that will control it.

Understand Thread versus Matter → · Thread Group: border routers, hubs and bridges

What does a Thread border router do?

It connects a Thread network with the surrounding IP network. The role can be built into an existing supported product. It is distinct from a Matter controller, even when one device performs both.

In a home: Inventory supported equipment before buying another network box.

Check the Thread border router list → · Thread Group: border routers, hubs and bridges

What is a trigger in a smart home automation?

The event or change that starts an automation’s evaluation. A trigger is distinct from conditions checked afterward and actions requested by the rule. Choose an event that reflects the task you actually want.

In a home: A door opening starts a check; a lamp turning on is the requested action.

Build a trigger, condition and action plan → · Home Assistant: triggers

What does manual-on, automatic-off mean?

A lighting-control mode in which a person turns the light on and the sensor can turn it off after detecting no activity for the configured period. This differs from automatically switching on upon entry.

In a home: A bedroom can retain manual control of when the main light comes on.

Compare vacancy and occupancy sensing → · Lutron: occupancy and vacancy sensor modes

Do watts measure brightness or energy?

A unit of power. Watts describe the rate of electrical use or supply, not accumulated energy and not visible brightness. For light output compare lumens; for usage over time compare watt-hours or kilowatt-hours.

In a home: A 10 W example lamp running for five hours uses 50 Wh, or 0.05 kWh.

Read home energy measurements → · Hydro One: units in energy monitoring

What is Z-Wave compared with Zigbee?

A smart-home wireless technology with its own compatible devices and controllers. It is distinct from Zigbee. Check regional product compatibility and the exact controller’s supported functions before mixing equipment.

In a home: A product intended for another radio region should not be assumed suitable for a Canadian setup.

Compare Z-Wave and Zigbee → · Z-Wave Alliance: certified products and radio regions

What is Zigbee, and does it need a hub?

A low-power wireless technology used by compatible sensors and controls. A typical platform uses a coordinator to form the network. Hub compatibility and support for specific functions still need checking.

In a home: An existing supported Zigbee hub may be useful for one more compatible sensor.

Compare Zigbee and Z-Wave → · Connectivity Standards Alliance: Zigbee