Ok kiddo, so in Utah they passed a law that says that gold and silver coins have to be accepted as money, just like paper dollars. And that means people can use them to buy stuff, pay bills or trade with others.
Now, why did they do this? Well, some people think that paper money isn't always worth what it says it is because the government can print more of it whenever they want. But gold and silver have to be mined and they hold their value over time.
So, the Utah Legal Tender Act basically says that if you have gold or silver coins, they are worth what's written on them and people have to take them as payment. But don't worry, you don't have to use these coins if you don't want to. Paper money and credit cards are still accepted too.