Nix is a powerful package manager designed for Linux and other Unix-like operating systems. It is known for its unique approach to package management, providing a declarative and reproducible way of managing software installations. One of the key features of Nix is its ability to allow multiple versions of the same package to coexist on a system without conflicts. This is achieved by using an immutable store where all packages are stored, and each package is identified by its cryptographic hash. This ensures that the installation of one package does not affect any other package, providing a high level of isolation. Nix also employs a functional programming language called the Nix expression language (Nixpkgs) to define packages. The Nix expression language allows users to specify dependencies, build instructions, and runtime environments in a declarative manner. This makes it easier to reproduce software installations across different machines or even different operating systems. The Package set in Nix refers to the collection of packages available for installation. It includes thousands of pre-built packages maintained by the Nix community, covering a wide range of software applications and libraries. This extensive collection makes it convenient for users to install and manage software without having to build everything from source. In addition to the Package set, Nix also supports creating custom packages or modifying existing ones as per user requirements. Users can define their own packages using the Nix expression language and share them with others through various channels like GitHub or personal repositories. Overall, Nix provides a flexible and reliable approach to managing software installations through its unique package management system and extensive Package set. It offers reproducibility, isolation, and customization capabilities that make it popular among developers, researchers, and system administrators alike. # References ```dataview Table title as Title, authors as Authors where contains(subject, "Nix") ```