Per Wikipedia, a [Wiki](https://en.wikipedia.org/wiki/Wiki) is:
> A wiki is a knowledge base website on which users collaboratively modify content and structure directly from the web browser. In a typical wiki, text is written using a simplified markup language and often edited with the help of a rich-text editor.
:warning: There are many different implementations of Wikis in use, and all have differences in syntax. If you have used wikis before, please check the [overview](https://docs.gitlab.com/12.4/ee/user/project/wiki/index.html) to understand the differences before getting started.
GitLab provides a built-in Wiki for each project:
> A separate system for documentation called Wiki, is built right into each GitLab project. It is enabled by default on all new projects and you can find it under Wiki in your project.
Wikis are very convenient if you don’t want to keep your documentation in your repository, but you do want to keep it in the same project where your code resides.
An [overview of how GitLab Wikis work is here](https://docs.gitlab.com/12.4/ee/user/project/wiki/index.html). This page covers the basics of creating and editing a Wiki on GitLab and should be enough to get you started.
