What type of movement does a pivot joint facilitate?

A pivot joint primarily facilitates circular movement. This type of joint allows for rotational motion around a single axis, enabling one bone to rotate around another. An ideal example of a pivot joint is found in the neck, where the first and second cervical vertebrae (the atlas and the axis) allow the head to turn from side to side.

In the context of the other options, while flexion and extension are movements associated with hinge joints (like the elbow), rolling motion is not specifically attributed to pivot joints, and sliding motion is typically associated with gliding joints. Thus, the primary characteristic of a pivot joint is its ability to enable circular movements, clearly distinguishing it from the other types of movement mentioned.