League of Legends, or LoL, as it's abbreviated, is a multiplayer online battle arena video game published by Riot Games. It was officially released on October 27, 2009. The game is played either as a single player (solo) or with two teams of five players each.
The game is based on a continuous online battle between two teams of five players, with players starting as "newbies" and working their way up to fully-fledged champions using experience points, or XP as it's called in-game.
A player gains experience by killing the opposing team's minions, denoted as "meat," early on in the game and subsequently kills players. Experience points are awarded to the player with the most recent kill. The game is won by the team that kills the opposing team's General.