What is MMR in League of Legends and why is it a hidden mechanic ?

MMR or Matchmaking Rating is a feature in League of Legends that is used to match players who have similar skill levels.

BHVR, sure, we'll take MMR, we'll trust how it works, we'll even

How to Check Your MMR in League of Legends

NEMO

Even pro players don't know some fundamental mechanics : r/DotA2

How does league of legends MMR work? : r/leagueoflegends

Battle.net Leagues - Liquipedia - The StarCraft II Encyclopedia

Dota 2 mechanics which you'll never survey in LoL

LoL MMR in Season 2022 How to check it & How to improve it

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Riot clarified some things about MMR (win streaks, personal

What is MMR in League of Legends and why is it a hidden mechanic ?