The Prusik grips tightly when loaded, but without a load slides freely up and down the rope. It can be tied with one hand and does not damage the cord. However, the Prusik tends to jam. It is principally used for attaching loads to a cord or for making the cord easier for climbing.
Fold the rope in half to create an open loop and place the loop behind the cord.
Pass both ends over the cord and thread them through the loop.
Pass both ends over the cord between the 2 small hitches and through the loop.
Pass the ends through the loop again the same way.
The Prusik knot is complete.