The document discusses different types of joints in the human body. There are three main types of joints: fixed or immovable joints where bones overlap and do not move; slightly movable joints where bones can move a little and are connected by ligaments and cartilage; and freely movable or synovial joints where bones move freely, including ball-and-socket joints in the hips and shoulders. The document further describes six types of synovial joints based on their movement: ball and socket, hinge, pivot, gliding, saddle, and condyloid joints. Examples are provided of each type of joint and how they enable different motions.