So you know how a library has a lot of books with stories and important information? Well, the Library of Congress is a really big library with way more books than you can imagine.
Now, a "legend" is someone who is really famous and important because of what they have done. It's kind of like how your favorite superhero or cartoon character is a legend because they do cool things and everyone knows who they are.
The Library of Congress Living Legend is a special award that is only given to people who have done amazing things in their lives. These people might be writers, musicians, scientists, or even politicians who have made a big difference in the world.
It's like they are so special that the Library of Congress wants everyone to know about them and their wonderful achievements. And that's why they are called "living legends," because they are still alive and doing great things!