WordPress is an open-source content management system (CMS) that can be used to build blogs and websites. It allows users to install plugins and widgets to customize and expand functionality. WordPress can be used as a blog or to supplement an existing website, but is not intended to entirely replace a website. It exists in both hosted and self-hosted versions, with tradeoffs between ease of use and control. The presenter demonstrates how to install WordPress locally using XAMPP for development and testing purposes. Resources for learning more about WordPress and plugins are provided.