<human>:  What is Black Friday and its significance?
<bot>: Black Friday is the Friday following Thanksgiving Day in the United States, when typical retailers offer promotional sales. It is seen as the beginning of the Christmas shopping season and is historically the busiest shopping day of the year, with stores offering significant discounts on popular items. The tradition is associated with throngs of shoppers out to take advantage of the great holiday deals and discounts that can be found during the 24-hour period.