Pure rolling is a special case of rolling. In pure rolling, there is no slipping between the body and the surface and the linear velocity of the body is the product of angular velocity of the body with the radius. But in the case of rolling, slipping does exist. Take the example of the tires of an aeroplane. While landing, when the tires just touch the ground, we notice steam due to the friction, that is rolling. And when after some time, the tire starts rolling without any steam, it is pure rolling.