Ok, so imagine you live in a place called Nazi Germany. It's a really scary time where a group of people called Nazis are in charge and they don't like a lot of other people because of their religion or where they come from.
Now, Christmas is supposed to be a happy time where families get together, decorate trees, and exchange presents. But in Nazi Germany, they wanted to change how Christmas was celebrated.
They didn't want people to celebrate the traditional Christmas because it came from Christian beliefs, and they didn't like Christians. Instead, they wanted people to celebrate something called "Yule," which is an ancient holiday that was celebrated by the Germanic people a long time ago.
The Nazi leaders wanted to make "Yule" a national holiday, so they started to make up their own traditions that reflected their ideas of what a perfect society should look like. They made decorations that were red, white, and black - the colors of the Nazi flag. They also put up big swastika symbols instead of stars on their trees.
They even created their own version of Santa Claus, who was called the "Yule Man." He was a figure who represented the Nazi ideal of a hardworking and disciplined society.
So, while Christmas was still technically celebrated in Nazi Germany, it was very different from what we know as Christmas today. It was a time when the Nazis could control what people celebrated and how they celebrated it. It's very important that we remember this time in history so that we can learn from it and make sure that things like this never happen again.