Interesting Marketshare Graph of WordPress as a CMS

CMS Usage Statistics

A CMS (content management system) provides structured content management features, such as the ability to store news documents, images, video and any other online content type imaginable. They are used for websites that normally have multiple editors and sections to create the foundation on many large websites.

CMS usage distribution for websites using CMS technologies

Pie Chart of spread, over top 1 000 000 sites:

Source: http://trends.builtwith.com/cms