# Device

> A physical device, or a service, that one or more entities belong to, like a thermostat with a temperature sensor and a humidity sensor.

Source: https://contributors.home-assistant.io/glossary/device/

- In code: `DeviceInfo`, `device_registry`, `device_id`
- Also: devices

Integrations describe their devices with `DeviceInfo`: a name, manufacturer, model, and versions. Home Assistant keeps them in the device registry, where users can rename them and put them in an [area](https://contributors.home-assistant.io/glossary/area/).

A device can also be a service, like a weather forecast, so its entities are grouped together.

## Related terms

- [Entity](https://contributors.home-assistant.io/glossary/entity/): One thing Home Assistant can show, measure, or control, like a light, a temperature sensor, or a switch. Every entity has a state.
- [Registry](https://contributors.home-assistant.io/glossary/registry/): Where Home Assistant keeps what it knows about entities, devices, areas, floors, and labels, and what users changed about them.
- [Area](https://contributors.home-assistant.io/glossary/area/): A room or space in the home, like the kitchen, that devices and entities belong to.