built-in feature
nounUK /ˌbɪlt ɪn ˈfiːtʃə/
US /ˌbɪlt ɪn ˈfiːtʃər/
A part that comes with something and is already there when you get it.
The camera on my tablet is a built-in feature, so I don't need to buy one.
OTHER MEANINGS
2. Something that is naturally part of a person or thing.
Kindness is a built-in feature of her personality.
3. A function that is already part of a computer program or device.
The phone's built-in feature lets you take pictures without an app.
4. A quality that is always present in a situation.
Traffic is a built-in feature of city life.