A piano accordion is a type of musical instrument that combines the features of a piano and an accordion. It has a keyboard similar to a piano on one side and buttons for bass notes on the other. The instrument produces sound by forcing air through reeds when the player compresses or expands the bellows. Piano accordions are popular in various music genres, including folk, classical, and pop. They come in different sizes and keys, making them versatile for both solo performances and ensemble settings. Their portability and unique sound make them a favorite among musicians worldwide.