The subprime mortgage crisis was a time in the late 2000s when a lot of people who had taken out loans to buy homes ran into trouble paying them back. The thing is, these were loans that had been given to people who did not have good credit or who were not able to afford the loan. So when the economy started to struggle, more and more people were not able to make their payments on time. This led to many people losing their homes and had a big negative impact on the economy.