# id

> A unique string that identifies the SubsystemWithProvider that this descriptor can create.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine.SubsystemsImplementation](/engine/6000.5/script-reference/unityengine/subsystemsimplementation.md)
* **Assembly:** UnityEngine.SubsystemsModule

```csharp
public string id { get; set; }
```