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doc/manual/source/introduction.md
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# Introduction # Determinate Nix
Nix is a _purely functional package manager_. This means that it **Determinate Nix** is a downstream distribution of [Nix], a purely
treats packages like values in purely functional programming languages functional language, CLI tool, and package management system.
## How Nix works
Nix treats packages like values in purely functional programming languages
such as Haskell — they are built by functions that don’t have such as Haskell — they are built by functions that don’t have
side-effects, and they never change after they have been built. Nix side-effects, and they never change after they have been built. Nix
stores packages in the _Nix store_, usually the directory stores packages in the _Nix store_, usually the directory
@ -184,10 +188,14 @@ to build configuration files in `/etc`). This means, among other
things, that it is easy to roll back the entire configuration of the things, that it is easy to roll back the entire configuration of the
system to an earlier state. Also, users can install software without system to an earlier state. Also, users can install software without
root privileges. For more information and downloads, see the [NixOS root privileges. For more information and downloads, see the [NixOS
homepage](https://nixos.org/). homepage][site].
## License ## License
Nix is released under the terms of the [GNU LGPLv2.1 or (at your Nix is released under the terms of the [GNU LGPLv2.1 or (at your
option) any later option) any later
version](http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html). version][license].
[license]: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
[nix]: https://nixos.org
[site]: https://nixos.org