Q: what is the difference between a piano and keyboard(instrument)
A: if you say piano, it might be the big ebony/ivory one with all the strings inside, popular in europe 1600s/1700s, and all across the world for centuries after. entirely acousting instrument. if you say keyboard, it could mean any other instrument that uses that same keyboard layout but is not a piano, OR it can be made to sound like a piano. OR a keyboard can mean any thing with a lot of buttons you can press, could be for typing letters, i'm using one right now, .... OR, here's another twist, sometimes if it's digital but it is immitating a piano, it can be called a piano, OR, you might still have to call a digital keyboard a piano even when it doesn't sound like a piano IF you are trying to distinguish it from one you type letters on