Wordpress is an open source content management system which can be used to create websites, blogs and web apps.It is widely used on the web, around 35 % of all websites in the internet are using Wordpress. The software has an easy to use admin interface which allows users to publish and edit content without the need to have programming skills.

WP Official Theme Directory

There is a large community around Wordpress with developers, content creators and website owners. Also there is a huge ecosystem with thousands of themes and plugins to choose from