Pickups are magnets wrapped in coils of wire that convert the vibration of your strings into an electric signal, which is then sent on to your amplifier. The most common types are single-coil pickups, found on guitars like the Fender Stratocaster, and humbuckers, seen on the Gibson Les Paul. Since pickups’ positions on a guitar’s body give them unique tones, the pickup selector switch on electric guitars lets you choose which pickups you’re hearing.