Checking your League of Legends (LoL) MMR is an important step if you are interested in taking part in competitive play. MMR, or Match Making Rank, is a way to rate your own skill level in the game and can be used for matching you with opponents at similar levels. MMR can also be checked at any time to track improvement as your skills increase. It can take some practice to become skilled enough to affect your MMR, but the rewards come when you manage to reach higher and higher levels of ranking. In any case, checking your MMR is a great way to see how well you've done and will motivate you even further.