Vocabularies and terms are created. The next step is to assign a vocabulary to a content type, so the content type can use the vocabulary to categorize content. In Drupal 7, assigning vocabularies to content types works a little bit different from previous versions of Drupal. We have to designate a field inside a content type to hold such information as to which vocabulary we can use to categorize instances of the aforementioned content type. The field type we need to use for this is called term reference.