== Null edits == 

 Mmm'kay, apparently we need to have a small review session. 
 * Null edits: Usually done by hitting the edit link and pressing save without changing anything. These don't add revisions to the database and are generally used to do things like refresh the categorylinks on a given page. 
 * Dummy edit: Usually done by adjusting whitespace or making some other form of non-visible change to the wiki text and pressing save. These add a revision to the page and are generally done by people to leave extended edit summaries in the page history. (Also, stupid people use them to force the page links to refresh.) 

 More info: WP:NULL and WP:DUMMY. Spread the word. You're welcome.