Informants are individuals who provide information to authorities, such as law enforcement or intelligence agencies, often about criminal activities or security threats. They can be witnesses, insiders, or even participants in illegal activities who agree to share information in exchange for protection or leniency. The use of informants is common in investigations involving organized crime, drug trafficking, and terrorism. Their information can help authorities gather evidence, identify suspects, and prevent future crimes. However, the reliance on informants can also raise ethical concerns regarding their motivations and the accuracy of the information they provide.