WordPress started off as a stand alone blogging platform. Many thousands of people from around the world contribute to the project, and many millions of websites are powered by it — 25% of the web, in all. From personal blogs to large company websites and everything in between, everyone can use WordPress.
Editing your wordpress site also requires some technical knowledge and places more responsibility on you, the publisher.
Joomla requires a lot more technical skill than WordPress. But once built it is simple to use. (See image below)