Reel-to-reel refers to a type of audio recording technology that uses magnetic tape stored on reels. This format was popular from the 1940s to the 1980s for both professional and home audio recording. The tape moves past a playback head, allowing sound to be recorded or played back with high fidelity. Reel-to-reel machines typically consist of two reels: one for the supply of tape and another for the take-up of recorded tape. They are known for their durability and sound quality, making them a favorite among audiophiles and recording studios. Related topics include magnetic tape, audio recording, and audiophiles.