As a student, textbooks are indispensable. But most of us don't really know what to do with them once we're done. Do we sell them or throw them down the chute?
Amazon has made it easier (and cheaper as well) by including many textbooks in digital format. And to sweeten the deal, Amazon also provides the rental of textbooks for those who may not be needing them any longer than a semester. Rental can be for a month or even up to a year. And you get to keep your annotations and notes even after your rental has expired.