Kiting is a method of killing mobs where you use a damage over time spell, or ranged auto attack, and run from the mob until it dies.
The above is one form of kiting, while another type used by necromancers is known as fear kiting. This is accomplished by snaring a mob with a snare type spell, and then casting a fear based spell on them, forcing the mob to flee in terror from the player. At this point, the necromancer pet attacks the mob and chases it while the player continues to cast Damage over Time spells on the mob to bring down it's hit points until it dies. More than one mob can be brought down with this technique.