> 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/model-your-content/content-types-and-structure/data.md).

# Data

This section focuses on how to create data using the Umbraco backoffice

There are four kinds of content in Umbraco:

* The website **content** that make our the pages on your site exists in the Content section.
* **Elements** are reusable content items that are managed from the Library section.
* **Media** content such as images, videos, and PDFs are stored in the Media section.
* Finally, **Members**, are used for user profiles and frontend authentication which you can find in the Members section.

A fundamental principle in Umbraco is that all content types have a definition (Document Types, Media Types, Member Types). These definitions are highly customizable, meaning you can add properties and have complete control over how the data is organized.

## [Defining Content](/umbraco-cms/model-your-content/content-types-and-structure/data/defining-content.md)

Defining Document Types, adding properties, and creating content.

## [Creating Media](/umbraco-cms/model-your-content/content-types-and-structure/data/creating-media.md)

Defining Media Types and uploading files to the media section, using upload fields and image cropper.

## [Creating Members](/umbraco-cms/manage-and-publish-content/users-and-members/members.md)

Defining Member Types and creating members for authentication and user profiles.

## [Customizing Data Types](/umbraco-cms/model-your-content/content-types-and-structure/data/data-types.md)

Creating and editing Data Types.

## [Scheduled Publishing](/umbraco-cms/manage-and-publish-content/publishing-and-workflow/editorial-tools/scheduled-publishing.md)

Schedule when content should be published / unpublished automatically.

## [Adding Tabs](/umbraco-cms/model-your-content/content-types-and-structure/data/defining-content/adding-tabs.md)

Overview of how to add and reorder tabs, convert a group to a tab, and manage the “Generic” tab

## [Users](/umbraco-cms/manage-and-publish-content/users-and-members/users.md)

Control who has access to the Umbraco backoffice and what permissions they have.

## [Relations](/umbraco-cms/model-your-content/content-types-and-structure/relations.md)

An introduction to Relations and Relation Types, creating, and managing relationships between different entities in Umbraco.

## [Dictionary Items](/umbraco-cms/manage-and-publish-content/publishing-and-workflow/editorial-tools/dictionary-items.md)

Using Dictionary Items, you can store a value for each language. Dictionary Items have a unique key that is used to fetch the value of the Dictionary Item.

## [Content Version Cleanup](/umbraco-cms/develop-with-umbraco/configuration/content-version-cleanup.md)

How to keep the noise down whilst ensuring your important content versions stick around indefinitely.


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