A loop pedal is a device used by musicians to record and play back audio in real-time. It allows performers to layer sounds by recording a musical phrase and then playing it back while they add more layers on top. This creates a rich, multi-instrumental sound using just one instrument or voice. Loop pedals are popular among solo artists, especially guitarists and singers, as they can create complex arrangements without needing a full band. Many loop pedals also come with features like built-in effects and the ability to control tempo, making them versatile tools for live performances and songwriting.