broadly be divided into two categories: acoustic and electric.
Acoustic guitars are generally crafted from wood, be it the low cost laminates or the pure hard wood like spruce, or a combination of both. Acoustic guitars are hollow-bodied and do not need an external amplifier. However, their utility is hampered in bands and orchestras which call for mandatory electric amplification. Amplification can be done through piezo and magnetic pick-ups.
There are many types of acoustic guitars. Among them, classical and steel string guitars are the most popular. The classical guitar is adorned with nylon strings. The strings are plucked with the fingers or finger-nails. Besides pure classical music all kinds of modern music too can be played on it. The music repertoire of the classical guitar is vast and varied. The roots of the classical guitar can be traced back to the lute, the vihuela and the Renaissance guitar.
The steel strings of a steel-string acoustic guitar offer a brighter and louder sound. It is essentially larger than the classical guitar to accommodate the tension of the steel strings. A plectrum is a must for playing a steel-string guitar