 The e-commerce giant is holding its 10th Prime Day event featuring millions of deals across more than 35 categories, including electronics, kitchen, apparel, and beauty. The two-day summer sales extravaganza runs through Wednesday. Since it began in 2015, Amazon's Prime Day has become one of the most significant shopping events in the world. This year, shoppers are expected to spend about $14 billion, according to estimates from Adobe Analytics.