Boxing Day is traditionally the day following Christmas Day, when servants and tradesmen would receive gifts from their bosses[1] or employers, known as a "Christmas box". Today, Boxing Day is better known as a bank or public holiday that occurs on 26 December, or the first or second weekday after Christmas Day, depending on national or regional laws. It is observed in Canada, United Kingdom, Hong Kong, Australia, New Zealand, South Africa and some other Commonwealth nations.

And here I thought it has something to do with fighting!