Basically with most package managers you start from some base system and then execute commands which change the state of the system. With a functional system y

Basically with most package managers you start from some base system and then execute commands which change the state of the system. With a functional system you describe what kind of system you would like and it gets built for you. See https://nixos.org/nixos/about.html https://nixos.org/nixos/about.html