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# Actor

Common protocol to which all actors conform.

```
protocol Actor : AnyObject, Sendable
```

## Overview

The `Actor` protocol generalizes over all `actor` types. Actor types
implicitly conform to this protocol.

### Actors and SerialExecutors

By default, actors execute tasks on a shared global concurrency thread pool.
This pool is shared by all default actors and tasks, unless an actor or task
specified a more specific executor requirement.

It is possible to configure an actor to use a specific [`SerialExecutor`](/documentation/Swift/SerialExecutor),
as well as impact the scheduling of default tasks and actors by using
a [`TaskExecutor`](/documentation/Swift/TaskExecutor).

> SeeAlso: ``doc://com.apple.Swift/documentation/Swift/SerialExecutor``

> SeeAlso: ``doc://com.apple.Swift/documentation/Swift/TaskExecutor``

---

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