Detective agencies are private organizations that investigate various types of cases, including missing persons, fraud, and infidelity. They employ trained professionals, often called private detectives or private investigators, who use various methods to gather information and solve cases. These agencies can work for individuals, businesses, or legal entities. Many detective agencies also offer services like background checks, surveillance, and security consulting. They operate independently from law enforcement and can take on cases that may not be addressed by the police. Their work often involves collecting evidence, interviewing witnesses, and conducting research to uncover the truth.