The elbow is a joint in the human arm that connects the humerus (upper arm bone) to the radius and ulna (forearm bones). It allows for bending and straightening of the arm, enabling various movements such as lifting and throwing. The elbow is classified as a hinge joint, which means it primarily allows motion in one direction. Surrounding the elbow are ligaments, tendons, and muscles that provide stability and strength. Common injuries to the elbow include tennis elbow and golfer's elbow, which result from overuse. Proper care and exercise can help maintain elbow health and function.