For example, let’s look at this URL: http://www.somesites.com/forums/thread.php?threadid=12345&sort=date These URLs point to different pages. But if the search engine purges the information after the first offending character, the question mark (?), now look at this http://www.somesites.com/forums/thread.php One more important thing is dynamic pages usually do not contain any keywords in the URL. The best solution is URL Rewrite Tool. It not only saves our time and energy but also helps us to use static URLs by converting them transparently to our dynamic URLs, but it will also save our rankings in the search engines.