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Drupal Architecture

Drupal is a content management system. The system has mostly five layers. Let's understand how information flows between each of the system's layers.

Drupal's Entity system

Entities were introduced in Drupal 7 first time. In Drupal, entity is a general concept . So it may be  anything like noun(name, person, palace or a thing).

In Drupal each entity has a  purpose to represent/show a specific type of data.

Like the user entity, it displays user information. Content entities display content-related data.

entities can  be customized by adding fields to them called bundle.

bundles is a  subtypes of an entity type.

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