In Drupal 7, "Entity" is very a important term whose concept is difficult to understand at the first time. Entities can be used as the parent class of nodes. They are the abstraction of functionality common between Nodes, Taxonomy Terms, and Users (among others).
https://drupal.org/node/1261744
https://drupal.org/project/entity
http://evolvingweb.ca/story/drupal-7-entities-what-are-they-and-what-are-they-good
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