What is the bowline knot used for?

The bowline is used to attach a rope to a sale to hold it in place. The beauty of the bowline is that it is easy to undo after huge loads have been on it, it easy to tie, and it does not slip. When you're out in a storm at night, you want a knot that you can tie blindfolded, and also undo for that matter. It is also useful for making a loop that will not pull tight.