Content Construction Kit (CCK) module

Content Construction Kit (CCK) module considered as one among the best modules in Drupal. CCK used to create an input type or field for content type. It's a top ten must have modules.

Different from core profile fields, profile fields is comes with Drupal installation, and only can used to create additional fields for user profile. Where else CCK can be used to create any type, any additional fields for any content type. CCK can be said as the core for input type or fields, there are many other CCK integrated modules or add on can be further work with CCK, for instance money field, date field, email field, address field, and many others.

The good news is CCK is now in Drupal 7 core, which mean in Drupal 7, we're able to use CCK UI to create fields for any content type!