"P.I." stands for Private Investigator, a professional who conducts investigations on behalf of individuals, organizations, or law firms. They use their skills in research, surveillance, and analysis to gather information, uncover facts, and solve various types of cases. These cases can range from missing persons and fraud investigations to background checks and surveillance operations. P.I.s often work independently, employing their resourcefulness, attention to detail, and critical thinking abilities to uncover the truth and provide valuable insights to their clients.