An acoustic guitar is a guitar that uses only acoustic means to transmit the strings' vibrational energy to the air in order to make a sound. Acoustic means not electric or using electric impulses (see Electric guitar). The sound waves of an acoustic guitar are directed through the body of the guitar creating a sound. This typically involves the use of a sound board and a sound box to strengthen the vibrations of the strings. If you want more information about acoustic guitars click on one of the hyperlinks to go to Wikepedia for extended details.