Reel-to-reel is a type of magnetic tape audio recording system that uses large spools of tape to capture sound. The tape is wound around two reels, allowing for longer recording times compared to other formats. This technology was popular from the 1940s to the 1980s, especially among audio professionals and enthusiasts. The system operates by passing the magnetic tape over a playback head, which converts the stored magnetic signals back into sound. Reel-to-reel machines are known for their high sound quality and durability, making them a preferred choice for music recording and archiving.