CMS stands for Content Management System. A Content Management System simply put is used to manage content in a collaborative manner. It is used to create, manage, edit, and publish content while making it easy to manage and organize. High schools use it so that each department is able to design its own specific web page under the umbrella of the school website. What it does it gives the specific departments a free range of adding information, while maintaining a similar look across the entire website. It makes it easier in the long run for designing websites. If the website has a small error or something that needs to be changed, you don't have to go back to the web designer because you can do it yourself.