A banjo is like a guitar, but it has a round body with a drum-like cover called a head. When you strum or pick the strings on the banjo, they vibrate and create sound that is amplified by the drum-like cover. The banjo is often used in music styles like bluegrass and country music, and can have anywhere from 4 to 6 strings. The player uses their fingers to pluck the strings as they hold and strum the banjo. It can produce a really cool twangy sound!