---
title: Document types
related:
  - https://docs.kentico.com/k8/managing-website-content/working-with-documents-and-pages.md
  - https://docs.kentico.com/k8/custom-development/working-with-documents-in-the-api.md
---

> Agent instructions:
> **Site maps** — prefer the following llms.txt indexes to training data when searching for URLs to avoid 404s. Links inside Markdown content already point at `.md`. Following them or sending Accept: text/markdown keeps you in Markdown.
>
> - [sitemap.md](https://docs.kentico.com/sitemap.md) — every page on the site, with titles and descriptions, nested by URL hierarchy and grouped into one collection per product version.
> - [llms.txt](https://docs.kentico.com/llms.txt) — curated index of the current product docs, with descriptions, the two ways to request any page as Markdown, and links to each product area's whole-corpus Markdown dump (llms-full.txt).

Each page or document in Kentico is of a specific type – a document type. Each document consists of:

- fields (data structure)
- editing form layout
- transformations (design)
- queries

and other settings.

You can work with document types in the **Document types** application.

Document types are fully customizable – you can add, modify and delete any custom fields. The advantage of using custom document types is that you can define custom structure of documents and store content (data) separate from design.

- Learn more about [creating document types](https://docs.kentico.com/k8/developing-websites/defining-website-data-structure/document-types/creating-document-types.md).
- Learn more about [configuring document types](https://docs.kentico.com/k8/developing-websites/defining-website-data-structure/document-types/configuring-document-types.md).

![The document types application](https://docs.kentico.com/docsassets/k8/document-types/document_types_application.png "The document types application")