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1 The bridge holds the ends of the strings in place. 2  The guitar body amplifies the sound and sends it out through the sound hole. 3  The pick guard protects the guitar body from getting scratched by a pick. 4  The frets are the metal ridges embedded in the guitar neck.
The main purpose of the bridge on an acoustic guitar is to transfer the vibration from the strings to the soundboard, which vibrates the air inside of the guitar, thereby amplifying the sound produced by the strings. On all electric, acoustic and original guitars, the bridge holds the strings in place on the body.