A URL shortening service takes a long web address like https://hostedjobs.openhire.com/epostings/submit.cfm?fuseaction=app.allpositions&company_id=15953&version=1, and converts it to something short (but often even more obscure) like http://bit.ly/9sUe3. When you click on the shortened link, your web browser (Firefox, Internet Explorer, et cetera) contacts the shortening service’s web server just like any other request for a web page. Most services will reply with a simple HTTP Redirect, telling your browser to go open the longer URL instead. A few open the target URL in a frame, with a bar at the top encouraging you to share the site too — while tracking your activities, and possibly showing ads.