Final answer:
Synovial joints allow for smooth movements between adjacent bones. There are six types of synovial joints in the body, each allowing for specific movements. Ligaments support the joint and hold the bones together.
Step-by-step explanation:
Synovial joints allow for smooth movements between adjacent bones. They have a joint cavity filled with synovial fluid that lubricates the joint and reduces friction. The articulating surfaces of the bones are covered by articular cartilage, and ligaments support the joint and hold the bones together, resisting excess or abnormal joint motions.
There are six types of synovial joints in the body, each allowing for specific movements. These include pivot joints, saddle joints, plane joints, condyloid joints, and ball-and-socket joints. Each type of joint is necessary to provide the body with its great flexibility and mobility.