Rolling Motion of a body is a combination of both translational and rotational motion of a round shaped body placed on a surface. When a body is set in rolling motion, every particle of body has two velocities – one due to its rotational motion and the other due to its translational motion, and the resulting effect is the vector sum of both velocities at all particles.
Rolling Motion is classified in two categories – Pure Rolling & Rolling with Sliding.
Pure rolling is a case when the point of bottom contact of rolling body with ground remains at rest and body is considered to be rotating about this point of contact. For Detailed understanding of rolling motion see the video below – https://youtu.be/iMQBvpt-IoU
In pure rolling on a rough surface, the body experiences static friction if an external force is acting on it and as the point of contact remains at rest no energy is dissipated due to friction. There are many varieties of problems which are framed on the concept of pure rolling. To understand the applications of pure rolling see the example videos –