There are many different styles of play. Chords are played by strumming all of the strings. Classical guitarists pluck the strings with their fingers and always play sitting down. Slide guitarists slide along the strings with a slide made of metal or glass. Whether you're interested in classical, bluegrass, flamenco, folk or blues, the acoustic guitar is something you can enjoy playing alone or in a group.
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Unlike many string instruments which use a bow to create a sound, guitars are played by plucking or strumming the strings on the instrument, which vibrate to create a sound. Chords are played when the guitarist holds their fingers down on more than one individual string to change its length, which in turn changes the frequency of the vibration created - in other words, it creates a different note. Performers often use guitar tabs, rather than sheet music, when learning music: this acts as a kind of 'map' to teach guitarists where to put their fingers on the strings.