Okay, so let's say your grandparents have a lot of money and when they pass away, they want to give some of that money to you and your parents. That's really nice of them, right?
But the government also wants some of that money, so they charge something called an "inheritance tax". This means that if your grandparents leave a lot of money to you and your family, you might have to pay some of it to the government.
It's kind of like when you get money from the tooth fairy or a birthday gift, but then your parents take a bit of it to save for your future. The government is just taking a bit of the money your grandparents leave behind to save for the country's future needs.
The amount of inheritance tax you have to pay depends on how much money your grandparents leave you and the rules in your country. Some countries have higher inheritance taxes than others.
But don't worry too much, because usually only very wealthy people have to pay inheritance tax. For most people, they won't have to worry about it.