Okay kiddo, have you ever heard of piggy banks and how people save their money in it? Well, a country has its piggy bank too and it's called the treasury. Just like when you save your money in your piggy bank, the government also saves its money in the treasury.
Now, the person in charge of taking care of the government's piggy bank is called the Master of the Treasury. This person is like the "mommy or daddy" of the treasury and their job is to make sure that all the money that belongs to the government is accounted for and managed properly.
They receive all the money from taxes, fees, and other sources and make sure that it's spent on things that are good for the people of the country like roads, hospitals, and schools. They also keep an eye on the government's expenses so they don't spend more money than what they have in their piggy bank.
So, the Master of the Treasury is an important person who helps the government save and spend money wisely, just like how you have to be careful with your piggy bank savings.