Alright kiddo - so in 2008 a really big thing happened in the world of money and business. It all started in the United States with something called the housing market. Lots of people were buying houses and borrowing money from banks to do it. But some of those people couldn't actually afford to pay back all the money they borrowed.
This caused problems for the banks who had given out all these loans. They suddenly realized they might not get all their money back. And if the banks can't get their money back, they can't give out new loans to other people who want to buy houses or start businesses.
So things got really scary really fast. People started losing their jobs because companies couldn't get loans to keep their businesses going. And when people lose their jobs, they don't have money to spend, which can make things get even worse for other businesses.
This problem didn't just stay in the United States, it spread all over the world. Countries that were connected to the US economy, like Europe and Japan, also felt the effects. The value of stocks and other investments went down, making people feel less secure about their money.
Governments around the world had to come up with ways to try and stop the problem from getting worse. They did things like giving money to banks to help them stay afloat, and lowering interest rates on loans to encourage people to borrow money and spend it.
But despite these efforts, the effects of the 2008 crisis were felt for years after it happened. Some people lost their homes, their jobs, and their savings. And it took a long time for the economy to recover and for people to feel confident in spending money again.