built-in
adjectiveUK /ˌbɪltˈɪn/
US /ˌbɪltˈɪn/
Something built-in is made as a part of something else and cannot be taken out.
The camera has a built-in flash that turns on when it gets dark.
OTHER MEANINGS
2. A feature or quality that is a natural part of someone or something.
Kindness seems to be a built-in part of her personality.
3. A piece of furniture or equipment made to fit into a space and stay there.
The kitchen has built-in shelves and a built-in oven.
4. Included as a standard part of a product or system.
This laptop comes with built-in Wi-Fi.
5. Existing as a natural and inseparable part of something.
The app has a built-in safety check to protect users.