On an acoustic guitar, the strings vibrate and the hollow part of the instrument, or the sound box,also vibrates.

VOA: special.2009.09.27

A pickup is a device that captures the vibration of the metal guitar strings and changes them into electronic sound signals.

VOA: special.2009.09.27

And then she quickly strummed by playing all the strings at once.

VOA: special.2011.03.06

His theory was that the devices and body should remain firm, allowing the strings to vibrate longer and sustain a sound.

VOA: standard.2009.08.14