WordPress is a factory that makes webpages is a core analogy designed to clarify what WordPress is & does. It stores your content that allows you to create & publish webpages only requiring a domain and a hosting site to work. WordPress has a web template system using a template processor. Its architecture is a front controller, routing all requests for non-static URIs to a single PHP file which parses the URI and identifies the target page. This allows support for more human-readable permalinks.
WordPress users may install and switch among different themes. Themes allow users to change the look and functionality of a WordPress website without altering the core code or site content. Every WordPress website requires at least one theme to be present and every theme should be designed using WordPress standards with structured PHP, valid HTML (HyperText Markup Language), and Cascading Style Sheets (CSS). Themes may be directly installed using the WordPress Appearance administration tool in the dashboard, or theme folders may be copied directly into the themes directory.