Okay kiddo, so you know how there are some people who are really, really rich? Well, the Forbes 400 is a super special list of the richest people in America!
Forbes is a magazine that writes a lot about money and business, and every year they make a list of the 400 people who have the most money in America. These people are called billionaires because they have billions of dollars!
To be on the Forbes 400, you have to have more than one billion dollars, and you have to be an American citizen or live in America. The people on this list usually have earned their money from things like starting their own companies, investing in businesses, or inheriting money from their families.
When Forbes makes the list, they also write about each person and explain how they got so rich. They also show pictures of their houses, their cars, and their fancy things. It's fun to read about, but remember that most people don't have that much money, and there are lots of ways to be happy without being a billionaire!