The portion of a dynamic URL that contains the search parameters when a dynamic Web site is searched. Query strings do not exist until a user plugs the variables into a database search, at which point the search engine will create the dynamic URL with the query string based on the results. Query strings typically contain ? and % characters. The following URL is an example of a dynamic URL with a query string as the result of a search in the Webopedia database for the term "query string." The portion of the URL in bold is the query string: http://search.internet.com/www.webopedia.com?IC_QueryText="query%20string"&IC_QueryDatabase=www.webopedia.com.