Ball and socket joint: It is a joint in which the ball-like end of one bone fits in the cavity of another bone. For example, shoulder joint.
Cartilage: The shock-absorbing cushion present at every joint is termed as cartilage.
Ligament: The tough elastic fibre that joins two bones is called ligament. It allows bones to move in different directions.
Locomotion: Locomotion is the movement of an organism from one place to another.