Which description fits a synovial joint?

A synovial joint is characterized by its ability to allow for free movement between the bones it connects. This type of joint is the most movable of all joint categories and is essential for a wide range of physical activities. Synovial joints are encased in a joint capsule filled with synovial fluid, which lubricates the joint and reduces friction during movement. Examples of synovial joints include the knee, elbow, and shoulder, all of which facilitate dynamic movements such as bending, rotating, and reaching.

In contrast, joints that permit no movement are typically classified as immovable joints or synarthroses, such as the sutures in the skull. Joints that allow for minimal movement are known as amphiarthroses, examples of this type include vertebral joints, which are connected by cartilage yet do not provide extensive mobility. Lastly, joints that bind bones with cartilage are known as cartilaginous joints, which, while they provide some flexibility, do not allow for the extensive range of motion that synovial joints do. Thus, the defining feature of synovial joints is their capacity for a wide range of motion, making them pivotal for various movements and activities.