One way to help in that process of organizing the Web is to use what people do in the Web.
– Ricardo Baeza-Yates, from a presentation on Extracting Semantic Relations from Query Logs
How related might different search queries be when they share a number of pages in search results, and searchers tend to click upon those shared results more than other results?
If you go to Yahoo’s search, and perform a search for the term [wcca], the first result that you see in the search results is a page titled “Wisconsin Circuit Court Access.” If you search for [wisconsin circuit court], you’ll see the same page at the top of the search results. If many people searching for each of those terms tend to mostly click on the link for that page, and no other pages, it’s possible that Yahoo might start considering those query terms to be very closely related.
Because of that relationship, the search engine might start offering searchers a query suggestion for a related term at the top of the search results for an original query.