Why do they call today Black Friday?

I have been wondering why is today after Thanksgiving, Called Black Friday? Is there A Reason for Naming it The" Colour Black". I was told its frist shopping day of the Christmas season. But didn't explain Why the Colour? It'seem to me it is referring to something ominous happens on this day every year. I see no logical reason for naming it that.

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MrSimons · 41-45, M

It probably refers to the idea of being "in the black," as in not in debt ("in the red"). In financial records negative amounts (losses) have been traditionally recorded in red, where as positive amounts (profits) have been recorded in black. Businesses take in more profit during the holiday season putting them "in the black," beginning after "black Friday."

Abbenthewarwolf · 18-21, M

@MrSimons thanks for that. Now that makes more sense.