The guitar is a stringed musical instrument which is played with the fingers or a plastic pick. It is widely regarded {{fact}} as a very versatile instrument. Most guitars have six strings. Acoustic guitars are made of wood, and produce sound based on the acoustics of their chamber. Electric guitars do not have such a chamber, and are typically used with an amplifier. Unless , unless you have a semi-hollowed body elecetric guitar which produces an acoustic sound while unplugged, and an electric sound when plugged in.