# Modules {#modules}

The Nixpkgs repository provides [Module System] modules for various purposes.

The following sections are organized by [module class].

```{=include=} chapters
generic.chapter.md
```

[Module System]: https://nixos.org/manual/nixpkgs/unstable/#module-system
[module class]: https://nixos.org/manual/nixpkgs/unstable/#module-system-lib-evalModules-param-class