Which of the following is a distinguishing feature of a synovial joint?

Synovial joints are characterised by the presence of a synovial cavity between the articulating bones. This cavity is filled with synovial fluid, which lubricates the joint and reduces friction during movement. Additionally, synovial joints typically have a joint capsule composed of fibrous tissue that surrounds the joint and helps maintain its stability. These joints allow for a wide range of movement and are found in various parts of the body, including the knees, elbows, and shoulders.