What is the difference between ARAnchor and ARUserAnchor?

Hi!

I was reading the Unity AR Kit Plugin Documentation and the Github Depository, and wanted to clarify the difference between an AR Anchor class and a AR User Anchor? Thanks!

AR Anchor usually refers to ARPlaneAnchor,ARPlane need time to detect,about 3-10 seconds? And the time depends on the environment.

But ARUserAnchor can create a anchor immediately. you can read the ARkit Example Scene of Unity,and you will understand all.

that is my test result ,i dont know it is right or not.