> For the complete documentation index, see [llms.txt](https://docs.umbraco.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.umbraco.com/umbraco-cms/17.latest/model-your-content/content-types-and-structure.md).

# Content Types and Structure

Learn how to define and structure content in Umbraco using Document Types, Media Types, Data Types, compositions, and relations.

In Umbraco, all content is defined by a type. Document Types define the fields on a page, Media Types define the properties of media items, and Member Types define user profiles. This section covers how to create and configure these content types and how to build structure through compositions and relations.

* [Backoffice](/umbraco-cms/17.latest/model-your-content/content-types-and-structure/backoffice.md) - key backoffice concepts: sections, trees, Document Types, Media Types, Data Types, and Property Editors.
* [Data](/umbraco-cms/17.latest/model-your-content/content-types-and-structure/data.md) - define Document Types, create Media Types, configure Data Types, and manage content in the backoffice.
* [Compositions](/umbraco-cms/17.latest/model-your-content/content-types-and-structure/composing.md) - share groups of properties across multiple Document Types using compositions.
* [Relations](/umbraco-cms/17.latest/model-your-content/content-types-and-structure/relations.md) - define and manage relationships between different content entities.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://docs.umbraco.com/umbraco-cms/17.latest/model-your-content/content-types-and-structure.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.