* Pianos are acoustic instruments, while keyboards are electronic instruments. This means that pianos produce sound by vibrating strings, while keyboards produce sound by using electronic circuits.
* Pianos have a much wider range of sounds than keyboards. This is because pianos have a much larger number of strings, and each string can be tuned to a different pitch. Keyboards, on the other hand, have a limited number of keys, and each key can only produce one sound.
* Pianos are much larger and heavier than keyboards. This is because pianos have a large number of strings and a heavy wooden frame. Keyboards, on the other hand, are much more portable and can be easily carried from one place to another.
* Pianos require regular tuning, while keyboards do not. This is because the strings on a piano can stretch and change pitch over time, while the electronic circuits on a keyboard do not.
Overall, pianos and keyboards are two very different instruments. Pianos are acoustic instruments that produce a wide range of sounds, while keyboards are electronic instruments that are more portable and easier to play.