Everything to know about Amazon's advertising business, which is $21 billion and growing

AWS CEO Andy Jassy, who is set to become Amazon CEO, helped oversee the cloud unit's rise.
Mike Blake/ReutersMarketers cut ad spending in the pandemic, but e-commerce advertising has boomed as people shop more from home - with Amazon leading the pack.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 joined Amazon i