How Do the Joints work?
Your joints are the movable connection between two bones. The key function of a joint is to make repeated and smooth movement between the two bones. A layer of cartilage covers the surfaces of the joint and is there to help smooth functioning; it basically prevents hard contact between joint and bone.
You get to see a joint where two bones meet; joints enable both adjoining bones to move with respect to one another. For instance, the elbow joint helps connect the bone of the upper and lower arm. Proper functioning of joints is also influenced by several related parts such as cartilage, muscles, ligaments, joint fluid, and bursa.