1v1 lol is a player vs player game. It is the most common type of multiplayer game, and it means that two players are each trying to defeat the other. The goal is to win by having more health or destroying your opponent's base. Many games have their own variations of 1v1, such as king of the hill or domination.
There are many different ways to play 1v1. You can choose a map and decide who gets to start. You can play on a small map like an arena, and you can play on a big map like an island or desert. You can also choose if you want to be in first person or third person view. You can even choose if you want to play offline or online.