# Sections & Trees

The Umbraco backoffice consists of sections (sometimes referred to as applications) which contain Trees.

Each section is identified by its name in the top navigation ribbon of the Umbraco Backoffice.

For example, when you load the backoffice, you'll see that the 'Content' section contains one tree: the content tree. Meanwhile, the 'Settings' section contains a number of trees such as Stylesheets, Document Types, Media Types, etc...

You can create your own sections and trees to extend Umbraco.

## [Sections](https://docs.umbraco.com/umbraco-cms/13.latest/extending/section-trees/sections)

Describes Umbraco Sections, configuration and APIs.

## [Trees](https://docs.umbraco.com/umbraco-cms/13.latest/extending/section-trees/trees)

Describes Umbraco Trees, configuration, APIs and events.

## [Searchable Trees (ISearchableTree)](https://docs.umbraco.com/umbraco-cms/13.latest/extending/section-trees/searchable-trees)

Explains how to customise the backoffice search of a Section Tree.


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# Agent Instructions: Querying This Documentation

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

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.umbraco.com/umbraco-cms/13.latest/extending/section-trees.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
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.