> For the complete documentation index, see [llms.txt](https://www.nl-portal.nl/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.nl-portal.nl/fundamentals.md).

# Fundamentals

- [Wat is NL Portal](https://www.nl-portal.nl/fundamentals/wat-is-nl-portal.md)
- [Architectuur](https://www.nl-portal.nl/fundamentals/architectuur.md)
- [5-lagenmodel](https://www.nl-portal.nl/fundamentals/architectuur/5-lagenmodel.md)
- [Integraties](https://www.nl-portal.nl/fundamentals/architectuur/integraties.md)
- [Zaak](https://www.nl-portal.nl/fundamentals/architectuur/integraties/zaak.md)
- [Mijn gegevens](https://www.nl-portal.nl/fundamentals/architectuur/integraties/mijn-gegevens.md)
- [Product](https://www.nl-portal.nl/fundamentals/architectuur/integraties/product.md)
- [Patronen](https://www.nl-portal.nl/fundamentals/architectuur/patronen.md)
- [Verzoek](https://www.nl-portal.nl/fundamentals/architectuur/patronen/verzoek.md)
- [Externe Taak](https://www.nl-portal.nl/fundamentals/architectuur/patronen/externe-taak.md)
- [Authentication en authorization](https://www.nl-portal.nl/fundamentals/architectuur/authentication-en-authorization.md): Standaard werkt NL Portal met zowel DigiD als eHerkenning.
- [Features](https://www.nl-portal.nl/fundamentals/features.md)
- [Object filtering](https://www.nl-portal.nl/fundamentals/zaakinformatie-object-filtering.md)
- [Open source](https://www.nl-portal.nl/fundamentals/open-source.md)