The classical guitar is the member of the guitar
family used in classical music. It is an acoustical wooden guitar with six
classical guitar strings as opposed to the metal strings used in acoustic and
electric guitars designed for popular music.
The shape, construction, and material of classical guitars vary, but typically they have a modern classical guitar shape, or historic classical guitar shape resembling early romantic guitars from France and Italy. Classical guitar strings were once made of catgut and nowadays are made of polymers such as nylon, with a fine silver wire wrap on the bass strings.
While "classical guitar" is today mainly associated with the modern classical guitar design, there is an increasing interest in early guitars; and understanding the link between historical repertoire and the particular period guitar that was originally used to perform this repertoire.
Different types of guitars have different sound aesthetics, e.g. different colour-spectrum characteristics (the way the sound energy is spread in the fundamental frequency and the overtones), different response, etc. Learning classical guitar involves instilling the crisp technique, shaping the dynamic range and also makes the right hand tone insanely better along with the timing.