MIDI keyboard
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A MIDI keyboard is a piano-style digital keyboard device used for sending MIDI signals or commands to other devices connected to the same interface as the keyboard. MIDI is an acronym for Musical Instrument Digital Interface (protocol). The basic MIDI keyboard does not produce sound. Instead, MIDI information is sent to an electronic module capable of reproducing an array of digital sounds or samples that resemble traditional analog musical instruments. These samples are also referred to as voices.
An encoding scheme is used to map a MIDI value to a specific instrument sample. Also, other sound parameters such as note volume and attack are included in the MIDI scheme. The keyboard merely acts as a MIDI controller of sound modules and other MIDI devices.