What is this Black Friday thing about? It`s everywhere!
Is this some special business idea cooked up to sell more things?
Origin of this is the commercialization of Christmas. As recently as the 1930s, the first socially acceptable day for Christmas themes to go up was the day after Thanksgiving. Big department stores placed the discounts to jump start the Christmas season.
The name "Black Friday" itself is because from Jan 1 until thanksgiving, the retail company hadn't yet made enough money to cover their total annual expenses, but on that day would bring in enough money that they were now in the black. (A similar concept is used for Tax Freedom day)