They do look alike, but the main principle that separates them from each other is how their individual mechanism produces sound; The Grand Piano produces its sound through pressing the keys which triggers the strings inside the piano to create noise (sound). The Digital Piano has no strings, so it relies on an electronic tone generator to produce sound, which are then used amplified using a speaker.
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Explanation:
They do look alike, but the main principle that separates them from each other is how their individual mechanism produces sound; The Grand Piano produces its sound through pressing the keys which triggers the strings inside the piano to create noise (sound). The Digital Piano has no strings, so it relies on an electronic tone generator to produce sound, which are then used amplified using a speaker.