WordPress is open source web software that you can install on your web server to create your website, blog, community or network. WordPress started out as a tool for blogging, but has evolved into a full-fledged Content Management System (CMS), capable of powering websites, networks and communities.

Currently, according to wordpress.org, there are over 25 million users world wide.

You can learn more about WordPress here or go ahead and join the 25 million wp users by downloading it.