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"Monad" is a cool word, and they have a reputation of being extremely profound and obscure. Lots of people in the Haskell world, as you probably know, find this a bit overwrought.

Yes, the mathematical background for the concept is very abstract, like everything in category theory. But in a way, talking about that is like going into "Principia Mathematica" to explain how sets work.

You can also just say that monad is a name for the general kind of thing that you can use with the do syntax. That is, types that support binding variables and returning values.

That the abstract mathematical theory of binding variables and returning values is a bit abstruse is not such a big deal. People can use IO without really grokking the theory of monads.

Yeah, to people used to imperative languages, it's surprising that you can't just call an IO thing in the middle of your function.

But that doesn't mean Haskell makes IO difficult. And it doesn't mean Haskell is a bad choice for IO-heavy applications.

I worked at a web startup that used Haskell for its backend. It worked extremely well, was quite short and clear, and rarely had problems.

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