Package management is the art of building and distributing software packages.
Nix is different from package managers like apt, dpkg, and yum in several important ways:
Nix always builds all packages from scratch, including the entire closure, or dependency tree, of that package.
But if a dependency is already present in the Nix store or in a remote cache, Nix can use that instead of rebuilding it, which means that Nix can provide incremental builds.
Nix has a language—also called Nix—that you can use to define your own package builds
Nix works on several platforms, including Linux, macOS, and Windows WSL.