An Institutional Review Board (IRB) is essential for protecting the rights of human research participants, required for all federally-funded research involving humans. Regulations dictate the IRB's composition, review processes, and the types of studies eligible for exempt, expedited, or full board reviews, emphasizing informed consent and subject safety. Researchers must undergo specific training and obtain IRB approval before commencing their studies, with strict guidelines on managing and reporting any changes or unanticipated events during the research.