What's a mortgage?

Imagine you really, really want a big toy castle, but you don't have enough pennies in your piggy bank to buy it all at once. So, you ask a friendly grown-up, like a bank, to help you buy it. The bank agrees and gives you the money for the castle, but you promise to pay them back little by little, like giving a penny every week.

That's what a mortgage is! It's when a grown-up wants to buy a house but needs help to pay for it. So, they get help from the bank and promise to pay back a little bit of money each month until the house is all theirs, just like how you would pay for the castle over time!