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Joints are the points where two or more bones meet, allowing for movement and providing stability to the body. They are classified into three main types based on their structure and function: fibrous, cartilaginous, and synovial joints.

Fibrous joints, also known as synarthroses, are the simplest type of joint. They are held together by dense connective tissue and do not allow for movement. Examples include the sutures of the skull and the interosseous membranes between certain bones.

Cartilaginous joints, or amphiarthroses, are connected by cartilage. They allow for limited movement and provide stability. There are two types: synchondroses, where hyaline cartilage connects bones (e.g., epiphyseal plates in growing bones), and symphyses, where fibrocartilage connects bones (e.g., the pubic symphysis).

Synovial joints, or diarthroses, are the most complex and mobile type of joint. They are characterized by a synovial cavity filled with synovial fluid, which lubricates the joint and reduces friction. Synovial joints are further classified into six types based on their structure and movement: plane (e.g., intercarpal joints), hinge (e.g., elbow), pivot (e.g., proximal radioulnar joint), condyloid (e.g., wrist), saddle (e.g., thumb), and ball-and-socket (e.g., hip).