I don't understand what is Gliding Joint?

The gliding joint, also called a plane joint or arthrodial joint, is a type of joint in which the articulating surfaces of the involved bones are flat or only slightly curved. Joints are important structures in the body that connect bones and allow movement and shock absorption. The ends of the bones that connect in the joint are called articulating surfaces. The unique, flat shape of the articulating surfaces in a gliding joint let the bones slide over one another, often allowing a large range of motion. These joints are present in the spine, wrist, foot, and the clavicle.