Boxing Day is a holiday celebrated the day after Christmas Day, thus being the second day of Christmastide.

In Canada, Boxing Day (French: le Lendemain de Noel) is a federal statutory holiday. Government offices, banks and post offices/delivery are closed. In some Canadian provinces, Boxing Day is a statutory holiday that is always celebrated on 26 December. In Canadian provinces where Boxing Day is a statutory holiday and it falls on a Saturday or Sunday, compensation days are given in the following week.

In the UK, Canada, Australia, Trinidad and Tobago, and New Zealand, Boxing Day is primarily known as a shopping holiday.

In some areas of Canada, particularly in Atlantic Canada and parts of Northern Ontario, most retailers are prohibited from opening on Boxing Day, either by provincial law or by municipal bylaw, or by informal agreement among major retailers, in order to provide a day of relaxation following Christmas Day. In these areas, sales otherwise scheduled for 26 December are moved to the 27th.

From Wikipedia