Fraudulent currency refers to counterfeit money that is produced with the intent to deceive and defraud. This type of currency mimics legitimate banknotes and coins but is created without the authorization of the government or central bank. Counterfeiting is illegal and can lead to severe penalties for those involved in its production or distribution. To combat fraudulent currency, many countries implement various security features in their currency designs, such as watermarks, holograms, and special inks. Law enforcement agencies, including the Secret Service in the United States, actively work to detect and prevent counterfeiting activities to protect the economy and maintain public trust in the financial system.