Counterfeit money refers to fake currency that is produced with the intent to deceive and defraud. It is designed to look like real money, such as U.S. dollars or euros, but is not authorized by the government. Counterfeiting is illegal and can lead to severe penalties for those caught producing or distributing it. To combat counterfeit money, governments use various security features in their currency, such as watermarks, holograms, and special inks. These features help people identify genuine bills and protect the economy from the negative effects of counterfeit currency.