Boxing Day is a holiday celebrated on the day following Christmas Day in the United Kingdom, Hong Kong and Commonwealth nations. Boxing Day occurs on 26 December.
The Oxford English Dictionary gives the earliest attestations from Britain in the 1830s, defining it as "the first week-day after Christmas-day, observed as a holiday on which post-men, errand-boys, and servants of various kinds expect to receive a Christmas-box"
In some European countries, notably Germany, Poland, Belgium, the Netherlands and the Nordic countries, 26 December is celebrated as a Second Christmas Day.
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. The employers would give each servant a box to take home containing gifts, bonuses and sometimes leftover food.