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Content-Construction Kit (CCK) is a standard way, in Drupal, to add properties to the core content item - a Node. There are many CCK Modules that provide a large variety of field types, from e-mail fields to image or video ones. Even so, sometimes standard toolset is just not enough and we need to write our own implementation. This short run-through of a tutorial will get you started. For more detailed documentation, you can refer to the offical CCK tutorial.