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# Cancellable

A protocol indicating that an activity or action supports cancellation.

```
protocol Cancellable
```

## Overview

Calling [`cancel()`](/documentation/Combine/Cancellable/cancel()) frees up any allocated resources. It also stops side effects such as timers, network access, or disk I/O.

## Topics

### Canceling actions

[`cancel()`](/documentation/Combine/Cancellable/cancel())

Cancel the activity.

### Storing instances

[`store(in:)`](/documentation/Combine/Cancellable/store(in:)-35vnt)

Stores this cancellable instance in the specified collection.

[`store(in:)`](/documentation/Combine/Cancellable/store(in:)-95sfl)

Stores this cancellable instance in the specified set.


---

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