WordPress

About

At it’s core WordPress consists of the WordPress Admin Area for site admin users to configure things, and a public front-end UI (the website).

WordPress uses software packages called themes to control the look and to extend the core functionality. Different themes can be used to provide different configurations, but only one theme can be active at a time (accept wen dealing with child themes). WordPress will not function without an activated theme, but all versions of WordPress ship with a default theme.