Amazon Prime Day has come and gone, leaving behind new records for digital sales that the company said beat last year's summer holiday, Cyber Monday and even Black Friday results when measured over 36-hour periods.

Within four short years, the made-up holiday has evolved from what one expert described as the "worst sidewalk clearance sale ever" to one of the industry's biggest shopping events. And the implications for brands selling, both on the platform and off, are bigger than ever.

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"It really does feel like Prime Day has grown up and has become a legitimate shopping holiday."

Cooper Smith

Gartner L2

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"Aside from technical mishap, I think in general the shopping experience and the types of products and brands available, was far superior for consumers. So it really does feel like Prime Day has grown up and has become a legitimate shopping holiday," Cooper Smith, director of Amazon IQ Research at Gartner L2, told Retail Dive on the podcast.

This time on the show, Smith and the Retail Dive team break down what lessons brands and competitors can glean from Amazon's massive day and how that may play into their holiday plans.

You'll hear all this and more in this episode, so sit back, relax and listen. You can stream the episode below or subscribe on iTunes or Stitcher.