Friendly fraud is when someone uses their own credit card or bank account to buy something they don't want and then tries to get a refund from the seller by saying they didn't make the purchase or they didn't get what they paid for. It's like if you asked your sibling to buy something for you online, but then you told them it was a mistake and asked them to take it back, when they hadn't even bought it yet. It's bad because it means the seller doesn't get paid and it also creates a problem for your credit card or bank because they need to figure out how to get the money back.