A MIDI keyboard, also known as a controller keyboard, is an electronic musical keyboard that sends MIDI (Musical Instrument Digital Interface) signals to other devices, such as computers or synthesizers. Unlike traditional keyboards, MIDI keyboards do not produce sound on their own; instead, they act as a controller, allowing you to play virtual instruments and manipulate various parameters within music software or hardware. They often come equipped with additional controls like knobs, faders, and pads to further enhance creative possibilities in music production and performance.