built-in
adjectiveUK /ˌbɪltˈɪn/
US /ˌbɪltˈɪn/
Something built-in is made as a part of something else and cannot be taken out.
The car has a built-in radio that you cannot remove.
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 permanently.
The kitchen has built-in shelves and cabinets.
4. Included as a standard part of a product or system.
This laptop comes with built-in Wi-Fi.