In Haskell, a monad is an abstraction representing a series of computations, allowing for chaining and handling side effects in a clean and composable way.  Monads are defined by two main operations: `return`, which wraps a value in a monadic context, and `>>=` (bind), which applies a function to a monadic value and combines the contexts. 

The concept of monads in functional programming is inspired by the mathematical concept of a monad from category theory, but they are not exactly the same.
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