This document is an introduction to WordPress that discusses its history and success. WordPress was created in 2003 by Matt Mullenweg and Mike Little as an open source blogging platform. It has grown tremendously over the past 8 years, with over 22% of websites now running on WordPress. Its success is attributed to being open source, focusing on blogging, ease of use, abundant themes and plugins, and a large developer community. While its code architecture can be an issue, WordPress continues conquering new areas and remains a massive success leading the way.