Sources: A basic module and Module system deep dive, nix.dev. Authors and editors are credited in the article. Copyright © 2016–2026 NixOS Foundation and contributors. Source license: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/; https://github.com/NixOS/nix.dev/blob/master/LICENSE.md); the complete source license text is included in LICENSE-CC-BY-SA-4.0.txt. Helper scripts cited and statically reviewed: https://nix.dev/_downloads/4094b12f51ac6e6660209d82d7bb356e/map.sh and https://nix.dev/_downloads/770939e594fe4b5dfabc3064d73281af/geocode.sh. This is a translated and combined edition with identified editorial changes and an original overview diagram.