A motion sensor, usually a passive infrared type, detects movement. It is great for hallways and entrances, but if you sit still reading or working, it may decide the space is empty and turn the lights off.

A presence sensor, usually based on millimeter wave radar, detects very small movements such as breathing, so it knows someone is still there. Vaety. uses presence sensors in spaces where people stay still, like living areas, bedrooms and offices, and motion sensors in transit spaces like corridors, stairs and entrances.

Using the right type in the right place is the difference between automation that feels natural and automation that is annoying. We choose per space, and we tune the sensitivity after installation so it feels right.