ELI5: Explain Like I'm 5

mandolin

A mandolin is a stringed instrument that looks like a guitar, but is much smaller. It has four strings and is usually held on the player's lap while they play. The strings are plucked with a pick or with the fingers, and the notes are made by pressing down on the strings with your fingers in different places. The mandolin is an old instrument, and it is used in a lot of kinds of music, like folk music and country music.