A node is a single piece of content that is published on a Drupal site.
If it is content... such as stories, videos, images, pages, etc... it is a node, comments are not treated as nodes but they are connected to a node. If you create your own content types, those would be nodes as well.
I hope this clarifies the term for people who are new to Drupal. If you have any comments, please leave them below. Drupal rocks!
