---
title: App Extension Support
framework: foundation
role: collectionGroup
role_heading: API Collection
path: foundation/app-extension-support
---

# App Extension Support

Manage the interaction between an app extension and its hosting app.

## Topics

### Extension Support

- [NSExtensionRequestHandling](foundation/nsextensionrequesthandling.md)
- [NSExtensionContext](foundation/nsextensioncontext.md)

### Share Extensions

- [Supporting suggestions in your app’s share extension](foundation/supporting-suggestions-in-your-app-s-share-extension.md)

### Attachments

- [NSItemProvider](foundation/nsitemprovider.md)
- [NSExtensionItem](foundation/nsextensionitem.md)
- [Add Functionality to Finder with Action Extensions](appkit/add-functionality-to-finder-with-action-extensions.md)

### Host App Interaction

- [NSUserActivity](foundation/nsuseractivity.md)
- [NSUserActivityDelegate](foundation/nsuseractivitydelegate.md)

## See Also

### App Support

- [Task Management](foundation/task-management.md)
- [Resources](foundation/resources.md)
- [Notifications](foundation/notifications.md)
- [Errors and Exceptions](foundation/errors-and-exceptions.md)
- [Scripting Support](foundation/scripting-support.md)