Bowline

Type of knot:
Termination knot

Uses:
To attach a rope to many different objects.
To attach a rigging carabiner to rigging line when using webbing slings.
*Note: This knot isn't recommeded to be used as the termination knot for a tree climber as it doesn't cinch onto the karabiner.

Additional info:
This knot is one of the most well known knots around the world as it can be heavily loaded and still easily untied and has other variations for different tasks.