What is "friendly-url"

The user-friendly URL is a website address that does not contain a "query string", instead entrusting a path to a user-friendly SEO resource and readable to people, for example: http://www.stackoverflow.com/questions/tagged/url-amigável.

Almost always achieved with the help of a engine reconfiguring, just as mod_rewrite to Apache or mod_rewrite for Lighttpd. Many content management frameworks have the ability to generate friendly Urls internally.