Shoppers said they were motivated by sales and promotions, such as limited-time offers, according to the trade group's annual survey.

Salesforce — which tracks digital spending from a range of retailers — estimated that Black Friday online sales totaled $79 billion globally.

Deals promoted as some of the best of the holiday season are expected to keep people across the United States glued to their computers and smartphones.

The biggest shopping day of the year—and ever.

Shoppers said they were motivated by sales and promotions, such as limited-time offers, according to the trade group's annual survey.