Rotation:
Rotation about a fixed axis is the angular motion about the axis. Play the following animation for obtaining the rotation of the rod about the axis passing through point O and perpendicular to the plane.
It follows that all particles move in circular paths about the axis of rotation and all lines in the body which are perpendicular to the axis of rotation rotate through the same angle in the same time.
General plane motion of rigid body is a combination of transition and rotation.