What is the 'figure-8' knot used in rock climbing?

What is the 'figure-8' knot used in rock climbing?

Daniel Wade (Rock Climbing Manager) gives expert video advice on: What is a 'carabiner' and how is it used in rock climbing?; How should I pick my carabiners?; How should I pick my rock climbing shoes? and more...

The 'figure-8' knot is used in a follow through version as your tie in knot when you tie in to the end of rope before you start climbing. It also can be used to tie in to the middle of the rope if you are using it as a bite. And it is also a way to equalize multiple anchor points at a buoy station by pulling two or three strands of rope together. It is a bite essentially at that point.