WordPress is a popular content management system (CMS) that allows you to create a website or blog from scratch, or to improve an existing website. WordPress is free and open source software released under the GPL.
The WordPress core files are located in the wp-content directory in your WordPress installation. The wp-content directory contains the themes, plugins, and content files for your website.
The WordPress page PHP file is located in the wp-content/pages directory. The wp-content/pages directory contains the pages for your website.
The page PHP file manages the content and layout for your pages.