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.

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Patch 4.6.0 Notes - Legends of Runeterra Patch Notes - RiotWatch

Riot clarified some things about MMR (win streaks, personal

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How To Fix Your MMR In League of Legends

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

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What's wrong with being Normal?. (also, try to be more positive