Bank fraud is when someone tries to take money from a bank without permission. It can look like a person using someone else's bank card to make purchases, or using fake bank accounts in someone else's name to take money from their account. It can also involve someone using their own bank accounts to buy things they can't afford or try to cover up illegal activities. Banks have lots of security measures in place to try to stop bank fraud from happening, like requiring customers to have passwords and use special security codes when they take out money.