What Is WordPress?
WordPress is an open source CMS (Content Management System). It is an online publishing platform, powered by PHP and MySQL, with a plug-in architecture and a template system. WordPress team calls WordPress a "Semantic Personal Publishing Platform". Indeed, they are right.
I would love to say that it is powerful PHP framework that enable people that do not know HTML, CSS, or any programming languages to build professional Web sites for their business or hobbies. This framework also enables advanced theme and plug-in developers to build Web applications to integrate into the Web sites of those who know little about programming.
For those who would like a simple Web site or just a blog, they can have a WordPress site completed as a matter of two to five hours. (Well, you may install WordPress with only a few clicks and complete a few pages within 5 to 30 minutes if you really want to make it simple with some of the most affordable hosting services.)