Drupal treats all the stored content on its web site as nodes. Any piece of content like blog, article, page, etc is considered as node. Although, the comments are not stored as nodes but they are always connected to a node.

In Drupal, a “node” is the basic unit of content. It can represent any individual piece of content on a Drupal website, such as a page, an article, a blog post, a forum post, etc. Each node has its own unique ID and can be assigned various attributes and properties, including content type, author, creation date, and more. Nodes are highly customizable and can contain various fields and elements, depending on the content type they belong to and the configuration of the Drupal site. They form the backbone of content management within the Drupal system, allowing administrators and users to create, edit, and manage content easily through the Drupal administrative interface.