As correctly stated before, Black Friday is the name given to the official start of the Christmas retail shopping season on the day after Thanksgiving. Traditionally, Thanksgiving weekend is the busiest shopping weekend of the year.
The "Black" part of the term is to indicate that this is when most retailers will return to operating "in the black," as opposed to "in the red," meaning dismal sales the rest of the year.
I worked retail for many years... sales are FUN :crazy: