Final answer:
Synovial joints have a joint cavity, allowing for the greatest range of motion among different types of joints. They are not directly connected by connective tissue or cartilage and are surrounded by an articular capsule.
Step-by-step explanation:
Synovial joints, also known as diarthrosis joints, have a joint cavity and allow for the greatest range of motion among the different types of joints. They are not directly connected by connective tissue or cartilage, which allows free movement between the bones. These joints are surrounded by an articular capsule and have articular cartilage covering the bone surfaces, reducing friction. Additionally, synovial joints contain synovial fluid, which lubricates the joint and reduces friction during movement.