An accordion is a musical instrument that produces sound by forcing air through reeds. It consists of a bellows, a keyboard, and buttons or keys. When the bellows are pushed or pulled, air flows over the reeds, creating musical notes. Accordions come in various sizes and types, including the piano accordion and button accordion. This instrument is commonly used in folk music around the world, particularly in regions like Europe and South America. Accordions are versatile and can play melodies, harmonies, and bass lines, making them popular in both solo performances and ensembles.