How to clip two overlapping GameObjects and make a part invisible ?

Hi, I'm a beginner in Unity.

I have a plane and a sphere (with a sphere collider) overlapping. I only want to keep visible the part of the sphere which is on top of the plane. The part below must be invisible and without collider (as if it doesn't exist). How do I proceed to do this ? I heard about clipping objects or using a specific shader... but I don't really understand how to proceed.

Thanks !