One of the most powerful and useful features in Drupal 7 is taxonomy, it is now fully integrated with fields. We can create, update, share, and delete fields in taxonomy. That was not possible in Drupal 6 or earlier. We could achieve the same result by using contributed modules or some hacking, though none as elegant as what Drupal 7 provides for us out of the box, because all these features are built into Drupal 7 core.
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