The European system of accounts is like a big book where all the money that a country makes and spends is kept track of. Imagine you have a piggy bank where you keep all your money. You have to write down how much money you put in and how much you take out. The European system of accounts is like that for the whole country. It helps people see how well the country is doing with its money. It keeps track of things like how much money is spent on schools or hospitals, and how much money is made from things like selling products to other countries. Just like you keep track of your pocket money, the European system of accounts keeps track of the big money in a country.