A classical guitar has some specific features in its anatomy. It has six strings with the treble strings made of nylon and the bass strings made from nylon wrapped in brass wire. The body is symmetrical ie. no cut-outs at the higher frets and is made of wood. There are no electronics involved, so no pickups - volume comes from simple resonance in the guitar body.
A classical guitarist is more than someone who simply plays a classical repetoire. The way the guitar is played is also important. Essentially, a classical guitarist plays by plucking the strings with his right hand fingers and thumb - strumming is a special effect, and no pick is ever used. There are other strong recommendations on the general posture of the entire body and guitar for classical guitarists that distinguish them from other guitarists.

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