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title: Haskell Language
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Haskell is a programming language; a formal notation for describing
computation. It can be described in terms of its [syntax]() and
[semantics](). It is also often helpful to know about the [origins]()
and [intuitions]() behind its concepts as well.

It is one thing to know *about* a language, and quite another to know
how to *use* it well. Learning to express ideas a language effectively
involves the [pragmatics]() of the language.

# Haskell Programs

A program in Haskell is a collection of [modules](), including at
least the `Main` module. Modules consist of [declarations](), which
define elements of the program. The declarations contain
[expressions](), which denote [values]() and have [types](). All of
the above are built syntactically from the [lexical structure]() of
text in files.

# Haskell Tools

Although Haskell is a useful language for communication of ideas about
computation between humans, it also forms a practical language for
executing programs on computers when coupled with [implementations]().