encompass-cs-docs/content/concepts/message.md

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---
title: "Message"
date: 2019-05-22T13:10:43-07:00
weight: 7
---
Similar to Components, Messages are collections of data.
Messages are used to transmit data between Engines so they can manipulate the game state accordingly.
To define a message, extend the Message class.
```ts
import { Message } from "encompass-ecs";
class MotionMessage extends Message {
public x: number;
public y: number;
}
```
Messages are temporary and destroyed at the end of the frame.
{{% notice notice %}}
Ok fine, since you asked, Messages actually live in an object pool so that they aren't garbage-collected at runtime. But you as the game developer don't have to worry about that.
{{% /notice %}}