"Righteous among the nations" is a special award given to people who did good things during a very sad and scary time called the Holocaust. The Holocaust happened during World War II, when a bad man called Hitler and his followers, the Nazis, wanted to get rid of all the Jewish people in Europe.
But some people were brave and did not agree with what the Nazis were doing. They knew it was wrong to treat the Jewish people badly just because of their religion. These people, who were not Jewish but helped them anyway, are called the "Righteous among the nations".
The award is like a medal, and it is given to people who risked their own lives to save the lives of the Jewish people during the Holocaust. It is a way to say thank you and recognize those who did the right thing, even though it was not easy.
So, whenever we hear about "Righteous among the nations," we remember the people who stood up for what is right and made a difference during a very difficult time in history.