The Prudential Regulation Authority (PRA) is a special group that helps make sure that banks and other financial institutions in the United Kingdom are being smart and careful with your money. They do this by making rules that these businesses have to follow to make sure they have enough money to cover any problems that might come up.
You know how sometimes you might put away some of your allowance money in a piggy bank or savings account so that you have it for later, like if you want to buy a toy or some candy? Well, banks and other financial institutions do the same thing, except with lots and lots of money from lots and lots of people like you.
The PRA helps make sure that these businesses are putting enough money into their piggy banks so that if anything bad happens, they won't run out of money and can still do their jobs of taking care of people's money. The PRA also watches over these businesses to make sure they're not taking too many risks or doing bad things with people's money.
Overall, the Prudential Regulation Authority is like a grown-up piggy bank watcher that makes sure that people's money is being taken care of properly by banks and other financial institutions.