Black Friday is a colloquial term for the Friday after Thanksgiving in the United States. It traditionally marks the start of the Christmas shopping season in the United States. Many stores offer highly promoted sales at discounted prices and often open early, sometimes as early as midnight or even on Thanksgiving. Some stores' sales continue to Monday ("Cyber Monday") or for a week ("Cyber Week"). Occurring on the fourth Friday in November unless November 1 is a Friday, Black Friday has routinely been the busiest shopping day of the year in the United States since 2005.