WordPress is an open source blogging platform that boasts the largest user base of any self-hosted blogging tool in the world. Users can set up a blog on Word-Press.com or install WordPress with a hosting company or on a personal server, allowing for flexibility and easy customization.
It’s highly extensible, with a veritable treasure trove of add-ons and plug-ins available both in the official WordPress repository and elsewhere on the Internet.Since the project is open source, it’s easy for developers to work with—and it’s free!