It's very similar to dota but it's grown huge in the last 2-3 years. It's free to play Here's my referral link if anybody wants to check it out.
http://signup.leagueoflegends.com/?r...c7ff6125257613


If you don't know wht dota is it's basically a 5v5 setup two teams try to kill the opponents primary base structure.
Type in League of legends in youtube and check out some videos.