the day after Thanksgiving
many stores have big sales, and it is common to see long lines of people waiting outside stores and in malls to get the best deals first before they run out
many Americans see Black Friday as the official beginning of the Christmas holiday season
The name "Black Friday" started to be used sometime after World War II, but it was not popular outside of Philadelphia until around 1975.
On the first Monday after Thanksgiving and Black Friday is CYBER MONDAY, when many people go online shopping.