A MIDI controller is a device that allows musicians and producers to create and manipulate music using digital instruments. It sends signals to software or hardware synthesizers, enabling users to play notes, control volume, and adjust various parameters. MIDI stands for Musical Instrument Digital Interface, which is a standard that allows different music devices to communicate with each other. These controllers come in various forms, including keyboards, drum pads, and even guitar-like interfaces. Many MIDI controllers are designed to work seamlessly with popular music production software like Ableton Live or Logic Pro, making it easier for artists to bring their creative ideas to life.