Playing by ear means to be able to play a song after hearing it. You do not need to read musical notation to learn to play by ear. The ability to play the piano without written music is just a matter of learning a few easy techniques.
Here is what T.S. from New York said:
"I am so thankful I learned to play the piano by ear and chord from your music lessons. It is so much easier for me. I want to learn more and more songs."