WordPress 101 Structure, themes, functionality. What is WordPress?. WordPress is an open source blog tool and publishing platform powered by PHP and MySQL. It's often customized into a Content Management System (CMS). It has many features including a plug-in architecture and a template system.
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All of these files connect to the mySQL database. That’s where the content lives.
Widgets mostly live in the sidebar, but can be in the footer or header too!