Wikidot Data Forms is a very powerful feature that makes it possible to build everything from simple applications in your wikidot sites to a complete content management system (CMS) across your entire site.
A normal wiki page holds unstructured text. A wiki page with a data form holds structured data in "fields", the same as a database. In many cases structured data in a data form is easier for your users to edit, to understand and to work with.
Some of the uses where data forms might work better than simple wiki pages are:
* main page for creating new pages in the band category and for listing bands: http://vineyard.wikidot.com/bands:main
* example page at http://vineyard.wikidot.com/band:queen
* live template at http://vineyard.wikidot.com/band:_template