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# XR Raycast Subsystem
Raycasts allow you to perform hit testing against AR-specific features. It is conceptually similar to the [Physics.Raycast](https://docs.unity3d.com/ScriptReference/Physics.Raycast.html), but raycast targets do not require a presence in the physics world.
There are two types of raycasts:- Screen point- Arbitrary ray
Some implementations only support one or the other. You can check for support with the [`XRRaycastSubsystemDescriptor`](../api/UnityEngine.XR.ARSubsystems.XRRaycastSubsystemDescriptor.html).
## Performing Raycasts
See the [Script API Reference](../api/UnityEngine.XR.ARSubsystems.XRRaycastSubsystem.html) for API help. Raycasts are tested aginst specified [`TrackableType`](../api/UnityEngine.XR.ARSubsystems.TrackableType.html)s, a mask of trackable types against which to raycast, and sorted by distance from the ray's origin.
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