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.

Rocket League ranks, MMR, and distribution explained

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

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Rocket League ranks, MMR, and distribution explained

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

LoL - How MMR works and where to see your hidden MMR

How to Calculate MMR In League of Legends: - Eloking