Sometimes people take other people's money in a wrong way. This is called financial crime. It's just like taking someone else's toy without asking them or hitting them to take their candy. But, in this case, it's about grown-ups and their money.
Financial crime means when someone does something bad like stealing or cheating to get money from others. These bad things can be done in many ways; for example, pretending to be someone else and stealing money from others, using fake emails or messages to trick people into giving them their financial information, or selling fake things to people and taking their money.
People who do financial crime are called criminals or fraudsters. Their actions can harm people by taking away their hard-earned money or making them lose their life savings. It's wrong to do financial crime and the police and the government take it very seriously.
Remember, we should always be careful when it comes to money matters and never trust strangers who ask us for our financial information.