A great benefit of ecommerce, when compared to the traditional brick-and-mortar world, is the ability for an online marketer to track, assess and correct marketing endeavors — almost at the click of a mouse. A specific product, service of offer is hot (or not) right now? A particular marketing effort is doing (or not doing) so well? A specific sales letter, text or even graphic on your website is causing sales to go way up (or way down)? Or one webpage is more popular than the others?