The acoustic guitar is one of the most common guitar used by the musician. Those kind of guitar are affordable and best for learning and practice.
Acoustic guitars are very old instruments used since the 14th century, by the time of Renaissance. At those time, it was also called a gittern and was carved from a single piece of wood. As far as we know about those gitterns, is that they had four strings and was considerably smaller than the acoustic guitar of today.
An acoustic guitar have the capacity to be
played without any
amplification, but you can of course amplify it by using various of
pickups or microphones. Like every guitar, the sound is produced by the
vibration of the strings. Because the strings only displace a small
amount of air, the sound must be increased by using a soundboard and a
resonant cavity, in that case, we talk about the
