The frictional force is a non-conservative force.
The non-conservative force depends on the path that is taken between the initial and final configurations. It can also be said that non-conservative forces are used for converting macroscopic motion into microscopic motion.
Other than frictional force, following is an example of non-conservative force:
When a baseball is hit by the baseball bat, the force acting on the ball is a normal force. Hit between the ball and bat is a macroscopic motion while the production of sound is a microscopic motion.