What is Amazon Prime Day? It's a day-long (or longer) extravaganza of exclusive deals for Amazon Prime members. During this sales-fest, the world’s biggest retailer will slash prices on a wide variety of items — some of them by as much as 50%. To get the most out of Prime Day, it pays to plan ahead — researching deals, deciding what to buy, and keeping track of when sales pop up. By preparing for Prime Day in advance, you can get the most for your money with minimal hassle.