A monad is just a monoid in the category of endofunctors. Haskell is a polymorphically statically typed, lazy, purely functional programming language.

A monad in Haskell is often associated with the Monad class, which is an Applicative, which is a Functor. Monads might be used to implement an identity function, to allow error checking without resorting to nulls, or maintain state within a functional paradigm.
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