"Conflict of Laws is the body of law that applies to legal relationships and disputes that have connections to more than one state or country. . . . Conflicts courses and treatises traditionally cover three topic areas: (1) personal jurisdiction (the power of courts to bind parties by their judgments), (2) choice of law (the law that courts apply in disputes where more than one law might apply), and (3) enforcement of judgments, including judgments from other court systems." (From Conflict of Laws: Examples & Explanations.)
Hornbooks are concise one-volume legal treatises, written primarily for law students on subjects typically covered by law school courses.