Private detectives, also known as private investigators, are professionals who are hired to conduct investigations on behalf of individuals or organizations. They often work on cases involving infidelity, missing persons, or fraud. Their tasks may include gathering evidence, conducting interviews, and performing background checks. These detectives typically have training in law enforcement or criminal justice and may hold licenses depending on the laws of their state or country. They use various tools and techniques, such as surveillance and research, to uncover information that can help solve cases or provide clarity to their clients.