keyboard

what is different between the piano and the keyboard?

A 'piano' is an acoustic instrument with weighted keys whereas a 'keyboard' is an electric instrument with unweighted (lighter) keys than a piano. 
the sound is different 

whats is different between the white key and the black key? 

there's no difference between the black and white keys in a musical sense. Black or white, the keys represent semitones in a 12-note chromatic scale.
 
born; April 1, 1873,                                        he was born in Hungary
nationality; Russia and U.S                             born: 1991
how tall:1.98                                                   age: 28 years old