what are 3 main types of joints?

The three main joints are as follows:

• Ball and Socket Joint The joint present between the arm and the shoulder is the ball and socket joint. At this joint, the end of one bone fits into the cavity of the other bone. This type of joint allows movements in all directions.
• Pivotal joint: This type of joint is present where the neck joins the head. These joints permit the bones to turn around  or rotate. However, it allows movement in some particular directions only. For example, we can turn our head in four directions i.e., right, left, forward, and backward.
• Hinge joints: Hinges allow the door to move to and fro. Knee and elbow joints are examples of hinge joints in our body. These joints allow movement in one direction only i.e., to and fro movement.