Purpose: Whip the ends of ropes to prevent fraying and prolongs the life of the rope.
Tying: Lay the twine against the rope and wrap the long end around the rope about 8 turns. Make a bight in the short end. Wrap the long end about 8 more times around both the rope and the bight. On the final turn pass the long end through the bight. Pull the short end to hide and secure the long one. Trim the ends off.
Animated Knots: http://www.animatedknots.com/commonwhipping/