Boxing Day is a holiday celebrated on the day following Christmas Day. Boxing Day is primarily known as a shopping holiday, much like Black Friday (the day after Thanksgiving) in the United States. Boxing Day is sometimes called Unboxing Day.
In Britain, it was a custom for tradespeople to collect “Christmas boxes” of money or presents on the first weekday after Christmas as thanks for good service throughout the year.
This custom is linked to an older British tradition: since they would have to wait on their masters on Christmas Day, the servants of the wealthy were allowed the next day to visit their families. Employers would give each servant a box to take home containing gifts, bonuses and sometimes leftover food.