2.  A joint is where two or more bones meet. There are different types of joints. The different types of joints allow the body to move in different directions.

3.  Ball-and- socket joint.  Hinge joint.  Pivot joint.  Saddle joint.

4.  A ball-and-socket joint allows movement in many directions, including back and forth, side to side and circular movements. Some examples of such joints are the hip joints and shoulder joints.  The ball-shaped end of one bone fits into the cup-shaped socket of another bone to form a ball-and-socket joint.

5.  A hinge joint works like a door hinge. It allows back and forth movements. Some examples of such joints are the knee joints, elbow joints, finger joints and toe joints.

6.  A pivot joint allows the rotation of a bone around another. An example of such joints is the neck joints.

7.  A saddle joint allows a bone to slide in two directions: back and forth, as well as side to side. An example of such joints is the thumb joints.