In England the 26th of December is well known as Boxing Day but why? (poll 7606055)

In England the 26th of December is well known as Boxing Day but why?

People recycle all the boxes from their Christmas presents

The Church takes boxes of food to poor people

People dress up in boxes and walk around the streets singing: Merry Christmas, I am a box

Parents put their children in boxes and take a long, peaceful nap

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See this poll on: https://poll.fm/7606055/embed