What is a joint?
The meeting point between two part of an object is a joint. In the human body, this meeting point is between two bones.
What types of joint are in the human body?
Fibrous, Cartilaginous and Synovial are the three main types of joints within the human body.
Fibrous joints are immovable. Cartilaginous joints have some movement, and synovial joints have free motion within anatomical pathways.
Much of the movement related joint damage occurs in the synovial joints when they are forced into motions outside of anatomical pathways.