What does Kite mean?

Kiting in League of Legends got it's name by keeping a safe distance from enemy champions like the gap you want between you and a kite you fly. In fights, a champion can kite by attacking and moving in-between attacks to create distance from himself and the enemy. AD carries often kite because they are killed the easiest and do damage with auto-attacks, yet other champions can use technique.

Example: Darius just gets kited to pieces by Ashe.