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# Nix Language
-The Nix language is
+The Nix language is designed for conveniently creating and composing *derivations* – precise descriptions of how contents of existing files are used to derive new files.
+It is:
- *domain-specific*
- It only exists for the Nix package manager:
- to describe packages and configurations as well as their variants and compositions.
- It is not intended for general purpose use.
+ It comes with [built-in functions](@docroot@/language/builtins.md) to integrate with the Nix store, which manages files and performs the derivations declared in the Nix language.
- *declarative*
@@ -25,7 +24,7 @@ The Nix language is
- *lazy*
- Expressions are only evaluated when their value is needed.
+ Values are only computed when they are needed.
- *dynamically typed*