WordPress.org is free blogging software. With WordPress.org, you can install themes and plugins, run advertisements, edit the database and even modify the PHP source code. WordPress.org is the home of this software. Anyone can download the software for free but it must be installed on a web server before it will work. Web servers are generally not free. Hosting your own WordPress software can be fun and rewarding; it also places full responsibility on the blogger. If you mismanage your web server, you can lose your entire blog.