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A balun (short for "balanced to unbalanced") is an electrical device that converts between a balanced signal (one with two conductors carrying equal and opposite signals) and an unbalanced signal (one with a single conductor and a ground). Baluns are commonly used in radio and audio applications to connect balanced transmission lines, such as twisted pair cables, to unbalanced systems, like coaxial cables. They help in matching impedance, reducing interference, and maintaining signal integrity.