+A [monoid](/wiki/monoid) is an [algebraic structure](/wiki/algebraic_structure) comprising a set with an associative binary operation and an identity element. It's a fundamental concept, extending a [semigroup](/wiki/semigroup) with a "starting point" for all operations, found in abstract algebra and computer science.
+## See also
+- [Group](/wiki/group)
+- [Ring](/wiki/ring)
+- [Category Theory](/wiki/category_theory)
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