Amazon's advertising revenue is soaring. Here's everything to know about its ad business.

AWS CEO Andy Jassy, who is set to become Amazon CEO, helped oversee the cloud unit's rise.
Mike Blake/ReutersAmazon's advertising business continues to soar as people shop more from home, its ad revenue rising 50% year over year in the third quarter to $8 billion.EMarketer said Amazon claimed 10.3% of the US digital ad market in 2020, up from 7.8% in 2019 - competing with Google and Facebook for ad budgets. That growth has attracted Walmart, Instacart, Walgreens and other retailers that have jo