means A panel of keys you press to type letters, numbers, and commands into a computer or to play a musical instrument.

from A straightforward English compound of "key" plus "board." The word "key" goes back to Old English "cǣg," meaning something that opens or unlocks — later borrowed for the levers you strike on a musical instrument, perhaps because each one "unlocks" a note. "Keyboard" first named the row of keys on instruments like the harpsichord, organ, and piano, and when typewriters arrived they borrowed the term; computers then inherited it wholesale, dragging the QWERTY layout along for the ride.