A legal opinion is a written interpretation of the law, either by judges to justify decisions or by attorneys to advise clients. Judicial rulings, published in law reports, establish legal precedent, as seen in cases like Pointer v. United States, where clarity in legal terminology was emphasized. Legal advice from attorneys, which remains confidential and advisory, supports commercial dealings, as illustrated in The Antelope.
Scholars such as John Marshall and Sir John Salmond have examined the relationship between law, facts, and ethical considerations, while opposing perspectives, such as those in Glidden Company v. Zdanok, highlight the evolving character of legal analysis. Legal opinions therefore connect abstract principles with real-world application, grounding decisions in both prior rulings and their surrounding circumstances.