# Custom card

> A card that is not part of the frontend, loaded by the user from a JavaScript file.

Source: https://contributors.home-assistant.io/glossary/custom-card/

- In code: `custom:`, `window.customCards`
- Also: custom cards

Custom cards are web components, used with the `custom:` prefix in a card's type. They can use everything the frontend passes to a card, like the `hass` object.

## Related terms

- [Card](https://contributors.home-assistant.io/glossary/card/): A block on a dashboard that shows or controls something, like an entity, a graph, or a weather forecast.
- [Custom integration](https://contributors.home-assistant.io/glossary/custom-integration/): An integration that is not part of Home Assistant Core, installed by the user in the `custom_components` folder.