Anatomical joints are the connections between two or more bones in the body, allowing for movement and flexibility. They can be classified into three main types: fibrous joints, which are immovable; cartilaginous joints, which allow limited movement; and synovial joints, which are highly mobile and contain a fluid-filled cavity. Synovial joints are the most common type and include examples like the knee, elbow, and shoulder. These joints are characterized by their structure, which includes cartilage, ligaments, and a synovial membrane that produces lubricating fluid. This design enables smooth movement and helps absorb shock during physical activities.