Final answer:
Pivot joints are synovial joints that allow for angular movement on only one axis. Examples include the articulation between the C1 and C2 vertebrae and the proximal radioulnar joint.
Step-by-step explanation:
Pivot joints are synovial joints that allow for angular movement on only one axis (monoaxial). These joints allow for rotation around a single axis. Examples of pivot joints include the articulation between the C1 (atlas) and C2 (axis) vertebrae, which allows for side-to-side rotation of the head, and the proximal radioulnar joint, which allows for rotation of the radius during forearm movements.