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# Package Management {#sec-package-management}
This section describes how to add additional packages to your system.
NixOS has two distinct styles of package management:
- *Declarative*, where you declare what packages you want in your
`configuration.nix`. Every time you run `nixos-rebuild`, NixOS will
ensure that you get a consistent set of binaries corresponding to
your specification.
- *Ad hoc*, where you install, upgrade and uninstall packages via the
`nix-env` command. This style allows mixing packages from different
Nixpkgs versions. It's the only choice for non-root users.
```{=docbook}
<xi:include href="declarative-packages.section.xml" />
<xi:include href="ad-hoc-packages.section.xml" />
```
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