I enjoy playing piano a lot. It is an acoustic , stringed instrument
I don't believe a piano is a stringed instrument. Perhaps you meant guitar?
No piano. The strings are struck by hammers
Oh I wasn't aware of that. Can you tell me more about how a piano works.
Piano
The piano is an acoustic, stringed musical instrument invented in Italy by Bartolomeo Cristofori around the year 1700 (the exact year is uncertain), in which the strings are struck by hammers. It is played using a keyboard, which is a row of keys (small levers) that the performer presses down or strikes with the fingers and thumbs of both hands to cause the hammers to strike the strings. 
The word piano is a shortened form of "pianoforte", the Italian term for the early 1700s versions
Electric grand piano
The electric grand piano is a stringed musical instrument played using a keyboard, in which the vibration of strings struck by hammers is converted by pickups into electrical signals, analogous to the electric guitar's electrification of the traditional guitar.
Since electric amplification eliminates the need for a resonant chamber, electric grand pianos are smaller and lighter (around ), and consequently more portable, than acoustic pianos. Electric amplification also bypasses the difficulty of having to mic a conventional grand piano, and thus makes an electric grand