# Simulation

> Any additional WorldFlags.Live World running in the application for background processes that queue up data for other WorldFlags.Live World (ie. physics, AI simulation, networking, etc.).

## Definition

* **Type:** Field
* **Namespace:** [Unity.Entities](/engine/7000.0/script-reference/unity/entities.md)
* **Assembly:** UnityEngine.EntitiesModule

```csharp
Simulation = 9
```