Body

From GuitarWiki

The largest part of the guitar where the Bridge, Saddle, and electronics are kept.

The guitar's body is of utmost importance: it provides the resonance that shapes the tone of an electric or acoustic guitar and provides the volume (or heft) of an acoustic guitar. It also makes it easier to play the instrument while seated. Acoustic guitars typically have a large, round hole (the sound hole) on their faces, which, due to the resonance of the body, amplifies the sound greatly. This is why acoustic guitars are louder and project their sound further than unplugged electric guitars.

Factors that affect a guitar body's tonal qualities include the type of wood, the construction (whether layered or one-piece, hollow or solid-body), shape and size, and more. However, a solid-body electric guitar's shape is mostly aesthetic rather than functional.