# Start()

> Starts an instance of a subsystem.

## Definition

* **Type:** Method
* **Namespace:** [UnityEngine](/engine/6000.7/script-reference/unityengine.md)
* **Assembly:** UnityEngine.SubsystemsModule

```csharp
void Start()
```

### Remarks

Once the instance is started, the subsystem representing this instance is active and can be interacted with.