A one-on-one battle, also known as a DUEL, is a fight between two people. It is usually a physical confrontation, but can also be a mental or verbal challenge. The term is derived from the Latin word duellum, which means 'war of two'. Historically, duels were fought to settle disputes between two parties, and were often used as a form of justice. In modern times, duels are still used in some cultures as a way to settle disputes, but are more commonly seen in sports or other competitive activities.