Okay, imagine you have a piggy bank where you keep your allowance. Now, let's say you want to buy something really cool that costs more than what you have saved in your piggy bank. You might go to your mom or dad and ask if they can lend you some money to help you buy that cool thing.
The United States government is kind of like you, but on a really big scale! They need money to pay for things like roads, schools, hospitals, and other important stuff. Sometimes they need more money than they have, just like you might need more money than what you have in your piggy bank.
So, the government asks people and organizations to lend them money, just like you asked your mom or dad. This is the public debt – it's the total amount of money that the government owes to others.
Just like you have to pay back the money you borrowed from your mom or dad, the government has to pay back the money they borrowed. They do this by selling something called "bonds" to people and organizations. These bonds are like IOUs that say the government will pay the money back later with interest.
Now, let's say you borrowed a lot of money from your mom and dad and it took you a long time to pay them back. The longer it takes you to pay them back, the more interest you have to pay them. The same thing happens with the government – the longer it takes them to pay back their debts, the more interest they have to pay.
Some people are worried that if the government keeps borrowing more and more money, they might not be able to pay it back and it could cause problems for the country. But, just like you should be careful about how much you borrow, the government is also careful about how much they borrow and how they use the money.
So, in summary, the US public debt is the total amount of money that the government owes to people and organizations. They borrow this money by selling "bonds" and have to pay it back later with interest.