What type of joint movement is described as the rounded or conical surfaces of one bone fitting into a ring of another bone or tendon, allowing for rotation?

The movement described in the question pertains to a pivot joint, where one bone's rounded or conical surface fits into a ring formed by another bone or tendon. This design facilitates rotational movement around a single axis. A quintessential example of a pivot joint is found in the neck, specifically between the first and second cervical vertebrae (the atlas and axis), which allows for the head to rotate.

Other types of joints described—such as gliding, hinge, and ball-and-socket—serve different roles in movement. Gliding joints allow for sliding motions between flat surfaces, hinge joints permit movement primarily in one direction (like a door), and ball-and-socket joints provide a wide range of motion in multiple directions. In contrast, the distinctive feature of the pivot joint is its ability to enable rotation, making it the correct choice for the type of movement described in the question.