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    Kirks Guitar and Music Primer
Here are the main bits and pieces that make up a guitar. Apart from the electronics, both acoustic and electric guitars are pretty much the same. The principle behind guitars is simple: to stretch precision made wires (the strings) down the length of a Finger Board and tighten them to certain pitches. The strings are held up and stopped at one end by the nut, the other end by the saddle, which is part of the bridge. They're fastened at one to the bridge and at the other to the tuning pegs, or machine heads. The frets, which are wires inserted into the fretboard, allow the player to accurately shorten or lengthen the strings with the finger tips so as to change the pitches of the notes and make music. The tension applied to the strings is adjusted with the machine heads. The tighter the tension, the higher the pitch.

Anatomy of the guitar
Acoustic guitars get their volume from the Soundboard. When the player twangs a string, it vibrates and passes that vibration onto the soundboard via the Bridge. It's the vibrating soundboard that we hear as 'guitar'. The soundhole allows the sound generated inside the body to escape and add to the overall tone.
Electric guitars get their volume from the pickups, which are essentially microphones. The vibrating strings affect the magnets in the pickups which send a signal to an amplifier down a cable which amplifies the signal and sends it to the speakers, and we hear the sound as 'electric guitar'.