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# Interprocess communication

Display activity-based services to people.

## Topics

### User activities

  <doc://com.apple.documentation/documentation/Foundation/NSUserActivity>

[`UIUserActivityRestoring`](/documentation/UIKit/UIUserActivityRestoring)

The protocol you adopt to restore an object’s state from a user activity.

### Services

[`UIActivity`](/documentation/UIKit/UIActivity)

An abstract class that you subclass to implement app-specific services.

[`UIActivityViewController`](/documentation/UIKit/UIActivityViewController)

A view controller that you use to offer standard services from your app.

[`UIActivityItemSource`](/documentation/UIKit/UIActivityItemSource)

A set of methods that an activity view controller uses to retrieve the data items to act on.

[`UIActivityItemProvider`](/documentation/UIKit/UIActivityItemProvider)

A proxy for data that passes to an activity view controller.


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