Both Dota2 and LoL belong to the relatively new genre in computer games that is now called Multiplayer Online Battle Arena or MOBA for short. The original Dota initiated the genre and several other games succeeded it, with these two leading the charge. Those games are very popular today so no surprise they are easy to bump into when you search.

But there is a more specific reason: their gameplay is based on controlling -- conincidentally -- three lanes that connect your base to that of your opponent. The ultimate goal is to push any of the lanes, or better all of them, and destroy the opponent's base.