Chevron U.S.A., Inc. v. Natural Resources Defense Council, Inc. is a landmark U.S. Supreme Court case from 1984 that established a legal framework for reviewing administrative agency interpretations of statutes. The decision created the 'Chevron deference' doctrine, which requires courts to defer to an agency's interpretation of a statute it administers if the statute is ambiguous and the agency's interpretation is reasonable. This case has significant implications for how administrative regulations are enforced and interpreted by courts.