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Nix & NixOS | Declarative builds and deployments

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# Declarative builds
and deployments.

Nix is a tool that takes a unique approach to package management and system configuration. Learn how to make reproducible, declarative and reliable systems.

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## Reproducible

Nix builds packages in isolation from each other. This ensures that they are reproducible and don’t have undeclared dependencies, so **if a package works on one machine, it will also work on another.**

## Declarative

Nix makes it **trivial to share development and build environments** for your projects, regardless of what programming languages and tools you’re using.

## Reliable

Nix ensures that installing or upgrading one package **cannot break other packages**. It allows you to **roll back to previous versions**, and ensures that no package is in an inconsistent state during an upgrade.

## Choose from over 120 000 Packages

The Nix Packages collection (Nixpkgs) offers a large selection of packages for the Nix package manager.

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## Examples

### Try new tools without fear

### Multiple languages, one tool

### Declarative dev-environments

### Minimal docker images

### Declarative cloud images

### Test your configurations

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