New York (CNN Business) Amazon said this holiday season was another record-setter. The overall retail sector had a big year too, signaling that the decade-long economic expansion in the United States still has some legs left in it.

Amazon AMZN Buoyed by sales of tens of millions of its own gadgets,said its top-sellers this holiday season included the Echo Dot , Fire TV Stick and Echo Show 5. The Alexa-enabled devices have been huge hits for Amazon in the past several years, helping the company capture the largest share of the voice assistant market

People bought stuff Amazon didn't make, too. Third-parties sold way more products on Amazon this year than they did last year. Although Amazon is notoriously and, for investors, annoyingly coy about specific sales data, the company said third-party product sales increased by a double digit percentage over last year, surpassing one billion items sold.

iRobot's IRBT Among the most popular were LOL Surprise Glitter Globe Doll Winter Disco Series with Glitter Hair, Roomba 675 vacuum and, of course, the perennially popular Instant Pot Duo 80 pressure cooker. Well, those were the most popular items for humans. Dogs enjoyed SmartSticks peanut butter chews, and cats were particularly into Temptations Classic cat treats this holiday season.

"The Guardians" by John Grisham was the most-sought-after book during the holidays. "Home Alone" was the most-searched holiday movie on Fire TV, and Mariah Carey's "All I Want for Christmas is You" has been the most-played song on Amazon Music since Thanksgiving.

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