> For the complete documentation index, see [llms.txt](https://haskell.gitbook.io/project/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://haskell.gitbook.io/project/master.md).

# What is Haskell?

Haskell 2020 is a functional programming language. It's not just functional, it's purely functional. First class and higher order functions, with purely functional data structures that are persistant.

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