object with rigidbody goes through solid object

I have a object(person) that I want to stand on a plane. Boxes and other gameobjects stay on the plane, but he goes through even though he is a rigidbody.

the rigidbody gives a gameobject some physical properties, like gravity and mass, but not a collider.

u need to add a collider, for persons like characters most of the times is a capsule, to detect collisions.