Final answer:
Planar joints, also known as gliding joints, are joints in which adjacent bones slide over each other and have limited movement. They have flat or slightly curved articulating surfaces and are found in the hand, foot, and spine.
Step-by-step explanation:
Planar joints, also known as gliding joints, are joints in which adjacent bones slide over each other and have relatively limited movement. These joints have flat or slightly curved articulating surfaces that allow for gliding movements. Examples of planar joints include the carpal bones in the hand, the tarsal bones in the foot, and the vertebrae in the spine. The range of motion in planar joints is limited and does not involve rotation.