The clove hitch is a 'stopper knot' used in the middle of a rope to stop either end of the rope from being pulled. It stops the rope from moving either direction, to some degree. As one side pulls, the friction and tension of the rope stops it. The same is true for the other side. Getting the knot undone is fairly simple as long as there is slack on at least one side. It is also a weight bearing knot that can be trusted. Knots can be an important part of survival and preparation. Knowing how to tie proper knots to accomplish a specific task can mean the difference in you being able to help someone in need, or your yourself falling also. Knot tying is a very perishable skill. If you don't practice regularly, you will soon forget. Learn to tie various knots! Check out this Knot Tying Kit which includes two practice cords and a carabiner: https://amzn.to/2MT4WnN The link above uses the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.