A private detective, also known as a private investigator or PI, is a professional who is hired to conduct investigations on behalf of individuals or organizations. They often work on cases involving infidelity, missing persons, or fraud. Private detectives use various techniques, including surveillance, interviews, and research, to gather information and solve cases. Private detectives are typically licensed and may have backgrounds in law enforcement or criminal justice. They operate independently and can work for law firms, corporations, or private clients. Their findings can be used in legal proceedings or to help clients make informed decisions.