Reproducibility. In a nutshell, it's a purely functional Linux distribution. That means all changes you make to your system are non-destructive. For example, y

Reproducibility. In a nutshell, it's a purely functional Linux distribution. That means all changes you make to your system are non-destructive. For example, you can always roll back to a previous OS state, which is represented by a hash computed from all packages installed, and all options you've set. In turn, package hashes are computed from the package sources and all inputs (buildtime and runtime package dependencies).