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# identifier

A unique identifier for the anchor.

```
var identifier: UUID { get }
```

## Discussion

Whether an anchor is created manually (with the [`init(transform:)`](/documentation/ARKit/ARAnchor/init(transform:)) initializer) or automatically by ARKit (and provided to you through [`ARSessionDelegate`](/documentation/ARKit/ARSessionDelegate), [`ARSCNViewDelegate`](/documentation/ARKit/ARSCNViewDelegate), or [`ARSKViewDelegate`](/documentation/ARKit/ARSKViewDelegate) methods), each anchor automatically receives a unique identifier value.

You can use this value to determine which anchors accompanying a specific [`ARFrame`](/documentation/ARKit/ARFrame) capture correspond to anchors in frames captured previously.

---

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