The taxonomy_fields module brings two important modules together: CCK and taxonomy. As CCK can assign fields to content types, taxonomy_fields can assign CCK fields to categories. By doing this, content types are not limited to the same range of fields anymore.
Nodes of the same content type can now contain absolutely different fields. Simply assign a field to a term and every node in this category will now contain this field. When choosing a new term for a node, the field-form will appear next time on the edit-page.
The CiviCRM Group gmap module allows you to create pages that display Google maps of your CiviCRM groups. It requires the Gmap module and the CiviCRM module.
Allows a user to use a taxonomy hierarchy to pre-select a list to be used as a select list (e.g. drop down)
The Taxonomy Search Widget is an addon widget to the node reference field type. It allows the admin to set up a taxononmy vocabulary that the user can select from to limit the node selection to only those nodes tags with a specific taxonomy term. It uses AJAX to update the selection widget.
Say you have pages on animals tagged with a taxonomy, and you have a content type that node references one of your animal pages. This widget means that the user first selects the type of animal, giving them a manageable selection box to find the right animal page from.
In short - all this does is make it nicer for the person selecting the node reference....
No extra data is stored in the node.
let take that step by step. Lets assume you have 100's of products, each of which is a node. Now, lets say you set up a vocabulary called productType. Each product node is tagged with one of the terms from your vocabulary (taxonomy).