Read more about them in our guide to digital pianos. Digital pianos replicate the sound and feel of a piano through a computer-based sound engine. A digital piano is like a piano, except it is entirely electric (i.e. Piano is the instrument you all know and all. A keytar has a keyboard, as does a Steinway piano. If it has black and white keys, it can be called a “keyboard”. Keyboard is a broad term for any key-based musical instrument.