Dr. Shabbir, WA,
"Black Friday" is a recently coined termed based purely on economics. It's the day (supposedly) when the retailers' books go into the black (from the red). In accounting, losses were traditionally written in red ink and profits were written in black. So on "black Friday" retailers are supposed to become profitable (possibly for the first time during the year since Christmas sales make up such a huge portion of consumer spending in the U.S. and other Western countries). In reality, I think the biggest day for consumer purchases during the year is the Saturday before Christmas. The term "Black Friday" has no religious meaning.