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Cyber Monday is a marketing propaganda term that refers to the Monday immediately following Black Friday being the busiest day of the year for retail electronic commerce. 

(Photo/Picture: Screenshot of CyberMonday.com homepage with logo)

The term Cyber Monday was created by the National Retail Federation and announced in conjunction with the deployment of their own website CyberMonday.com designed to serve as a portal for Cyber Monday deals and offers.

Black Friday is the Friday following Thanksgiving Day in the United States, which is the beginning of the traditional Christmas shopping season. The term dates back to at least 1966, although its usage was primarily on the East coast.

Wikipedia: Cyber Monday | Black Friday