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# Composite assets

Combine tracks and segments of tracks from multiple assets into a composite asset that you can play or process.

## Topics

### Compositions

[`AVComposition`](/documentation/AVFoundation/AVComposition)

An object that combines and arranges media from multiple assets into a single composite asset that you can play or process.

[`AVCompositionTrack`](/documentation/AVFoundation/AVCompositionTrack)

A track in a composition that presents media of a uniform type.

[`AVCompositionTrackSegment`](/documentation/AVFoundation/AVCompositionTrackSegment)

A track segment that maps a time from the source media track to the composition track.

### Mutable compositions

[`AVMutableComposition`](/documentation/AVFoundation/AVMutableComposition)

An object that you use to create a new composition from existing assets.

[`AVMutableCompositionTrack`](/documentation/AVFoundation/AVMutableCompositionTrack)

A mutable track in a composition that you use to insert, remove, and scale track segments without affecting their low-level representation.


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