Final answer:
A suture is a type of immobile fibrous joint found only in the skull, characterized by the absence of a joint cavity and united by fibrous connective tissue.
Step-by-step explanation:
A suture is an example of a fibrous joint, specifically found in the skull. These joints are characterized by the absence of a joint cavity and are held together by fibrous connective tissue. According to the information provided, sutures are a type of synarthrosis, which means they are immobile or virtually immobile. Fibrous joints like sutures strongly unite adjacent bones, providing stability and protection. It is important to note that other types of joints include cartilaginous joints and synovial joints, which differ from fibrous joints in their anatomy and degrees of movement.