It is primarily a UK holiday. There are several countries or cities throughout the world who celebrate it who have, historically, been connected with the UK, such as Australia, Hong Kong, Canada, New Zealand, and a few others.
To put it simply, Boxing Day is Christmas Day for servants.
Boxing Day was created for the servants of a king or very rich house to celebrate Christmas, because they had to serve on Christmas Day. The Lord of the house would command boxes be made up containing gifts and food and they were given to the servants the day after Christmas so they could observe their own celebration.
The derivative of this was that Boxing Day became a day of charitable giving to those less fortunate. So people would pop by their local church to put money in the donation box the day after Christmas.
This year Boxing Day lands upon the Lord’s day. Boxing Day is the day the servants celebrate. So let all of us who are servants of the king come together and celebrate the true intended meaning of Christmas free from all of the worldly trappings that normally surround the 25th.
We are servants of the one true king and Saviour Christ Jesus our Lord. Let us all come together and worship the king, giving thanks. No earthly king has ever boxed up a better gift for his servants than our king has provided for us.
“Serve the LORD with gladness: Come before his presence with singing.”