Entity

Drupal site data is divided into so-called ‘entity types’, such as content itself (nodes), comments, users, taxonomy terms, taxonomy vocabularies and files. A single item of one of these types (or one of sub-types, named ‘bundles’) is called an ‘entity’. Examples of the entities are a site blog article, a comment to this article and its author profile page. The main characteristic of the entity is an ability to operate with data, specified in fields – this allows a site user to organize content types easily, depending on the purpose of the entity type or bundle. You can find a more detailed description and some examples at the official Drupal community page ‘An Introduction to Entities’.