When two rough surfaces come into contact, they generate: 

When two rough surfaces come into contact, they generate frictional force.
The force that resists or opposes the roling or sliding of one solid object over another is called friction. Frictional forces, such as the traction needed to walk without slipping, may be an advantage but also present great opposition to the motion.

The force can slow things down and stop stationary things from moving. If it were a frictionless world, clothes, and shoes would be difficult to keep on, more objects would slide, and it would be very hard for people or cars to move or change direction. For example, if a boy moves from left to right, the frictional force will affect the body from right to left.