KEY POINTS
  • Amazon has built a huge advertising business. Here's a little more about how it all works.
  • The e-commerce giant lets advertisers reach consumers through product ads or even videos on third-party websites.
  • While shopping on Prime Day, this is how to spot and understand some of the ad products used to encourage you to buy certain products.
The front desk of the Amazon office is pictured in New York, May 1, 2019.

If you were browsing Amazon in search of deals for Prime Day, you undoubtedly came across a lot of ads. That's because Amazon has a trove of information about buying habits that makes it a valuable place for advertisers.

Think about it: Amazon knows the last time you bought toothpaste on the site and which brand you typically like to buy. Advertisers can use that information to try to get you to buy their brand of toothpaste right when you're running low.