# Glossary

```{glossary}
Nix
    Build system and package manager.

    Read /nɪks/ ("Niks").

    :::{seealso}
    - [Nix Reference Manual](https://nixos.org/manual/nix)
    - [Nix source code](https://github.com/NixOS/nix)
    :::

Nix language
    Programming language to declare packages and configurations for {term}`Nix`.

    :::{seealso}
    - [Nix language tutorial](reading-nix-language)
    - [Nix language reference](https://nixos.org/manual/nix/stable/language)
    :::

Nix expression
    Expression written in the {term}`Nix language`.

Nix file
    File (`.nix`) containing a {term}`Nix expression`.

Nixpkgs
    Software distribution built with {term}`Nix`.

    Read /nɪks ˈpækɪʤɪz/ ("Nix packages").

    :::{seealso}
    - [Nixpkgs Reference Manual](https://nixos.org/manual/nixpkgs)
    - [Nixpkgs source code](https://github.com/NixOS/nixpkgs)
    :::

NixOS
    Linux distribution based on {term}`Nix` and {term}`Nixpkgs`.

    Read /nɪks oʊ ɛs/ ("Niks Oh Es").

    :::{seealso}
    - [NixOS Reference Manual](https://nixos.org/manual/nixos)
    - [NixOS source code](https://github.com/NixOS/nixpkgs/tree/master/nixos)
    :::

reproducible
    Reproducibility would guarantee exactly the same results no matter
    **when** or **on what machine** you run the command.
```