How do you call the joint where the end of the bone moves in a circle?

The joint where the end of the bone moves in a circular motion is called a ball-and-socket joint. This type of joint allows for a wide range of movement, including rotation, and is exemplified by the shoulder and hip joints. In a ball-and-socket joint, the spherical head of one bone fits into a cup-like socket of another, enabling multi-directional movement.