The guitar is a fretted musical instrument that usually has six strings.  It is typically played with both hands by strumming or plucking the strings with either a guitar pick or the fingernails of one hand, while simultaneously pressing the strings against the frets with the fingers of the other hand.  The tone of an acoustic guitar is produced by the strings’ vibrations, amplified by the hollow body of the guitar, which acts as a resonating chamber. Two common types of acoustic guitars are the dreadnought and classical styles. Each has its own variety of details and purposes.