December 26 is a public holiday known as Boxing Day in the UK and many other British Commonwealth countries such as Australia, Canada, and New Zealand.
There are various theories on why it is called Boxing Day.
Theory 1: Charity box for the poor.
Churches in old times took money from Churchgoers in the form of a collection and stored this money in boxes.
These boxes were opened the day after Christmas, and money was handed out to the poor.
Theory 2: Servants received Christmas boxes from employers after Christmas Day.
A Christmas present is also called a Christmas box in Britain.
Servants were required on Christmas for hosting guests, but they were given a day off by the employers on the next day.
On this day, the employer also gave Christmas boxes and boxes of leftover dinner to the servants.
Theory 3: Good luck box for sailors.
Money in a sealed box was considered good luck for sea travel in the old days and sailors would carry it for their voyages.
If the voyage was successful, they would give this box to the Church, which would open it after Christmas.
