Debian is a free operating system ( OS ) for your computer. An operating system is the set of basic programs and utilities that make your computer run. Debian uses the Linux kernel (the core of an OS) along with thousands of software packages (also called 'packages') that are each distributed in a separate file. The packages contain the program code that does all the work, and are connected to each other in what is called a package dependency hierarchy . Each package depends on some smaller package or packages, which in turn depend on even smaller packages, and so on.
Nix package manager solves the problem of inconsistent, incomplete package state by enforcing complete state by default. Nix provides atomic upgrades and rollbacks, side-by-side installation of multiple versions of a package, multi-user support, per-user profiles, and improved conflicts resolution. It also has powerful user environment management which makes it easy to work with multiple profiles.
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