All PvP matchmaking is based on an Matchmaking Rating (MMR) similar to the Elo system. Players of roughly equal skill will be placed in the same game.All PvP matchmaking is based on an Matchmaking Rating (MMR) similar to the Elo system

Does Dota use Elo?

As you may know its all going back to ELO or Elo rating system which originally comes from chess. In Dota 2 the ELO is defined as MMR, a value that shows the performance rate of a player. Valve just gave ELO a new name: MMR. Still, many significant games are using the word ELO such as League of Legends, Origins, etc.