WordPress is a free and open-source content management system. It’s used by millions of websites to publish their content. WordPress is unique because it’s a platform that anyone can download and run on their own computer.
To publish on their own WordPress Web site, individuals need to register for an account with WordPress.org. Users can post, update, and delete all types of content from within WordPress. WordPress.com is a free service that lets individuals create and manage their WordPress blogs through a Web interface.