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# Configuration Syntax {#sec-configuration-syntax}
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The NixOS configuration file `/etc/nixos/configuration.nix` is actually
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a *Nix expression*, which is the Nix package manager's purely functional
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language for describing how to build packages and configurations. This
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means you have all the expressive power of that language at your
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disposal, including the ability to abstract over common patterns, which
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is very useful when managing complex systems. The syntax and semantics
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of the Nix language are fully described in the [Nix
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manual](https://nixos.org/nix/manual/#chap-writing-nix-expressions), but
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here we give a short overview of the most important constructs useful in
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NixOS configuration files.
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```{=include=} sections
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config-file.section.md
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abstractions.section.md
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modularity.section.md
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```
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