> For the complete documentation index, see [llms.txt](https://sfdigitalservices.gitbook.io/karl-sf.gov-editor-help-center/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sfdigitalservices.gitbook.io/karl-sf.gov-editor-help-center/using-karl-the-cms.md).

# Using Karl the CMS

## SF.gov content management system 

SF.gov is built using a content management system, or CMS. The CMS for [SF.gov](http://SF.gov) is a custom product called Karl.

Digital Services engineers build and maintain Karl in [Wagtail](https://wagtail.org/).

### What is a CMS?

A CMS is software that organizes pieces of content and lets users arrange it to create a website. 

Content is pieces of text, pictures, audio, video– basically, all the stuff that’s on your website. 

The content management system lets you enter that content, save it, arrange it into pages, and finally, publish.