CRM Core is a tool for managing contact information within a Drupal website. It was designed to act as a platform, where developers can add small, useful applications on top of the core components to handle specific use-cases. It was also designed to be highly interoperable with Drupal so that people without any specialized programming knowledge could work with it.
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There have been plenty of articles about Drupal 7 and entities already. Entities are great. They provide a unified way to work with different data units in Drupal. Drupal 7 is all about entities. They are everywhere: nodes, users, taxonomy terms, vocabularies...
Let's take a closer look at how developers can create their own entities using the Entity API module, which is a great toolbox.