Entity API

Describes how to define and manipulate content and configuration entities.

Entities, in Drupal, are objects that are used for persistent storage of content and configuration information. See the Information types topic for an overview of the different types of information, and the Configuration API topic for more about the configuration API.

Each entity is an instance of a particular "entity type". Some content entity types have sub-types, which are known as "bundles", while for other entity types, there is only a single bundle. For example, the Node content entity type, which is used for the main content pages in Drupal, has bundles that are known as "content

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