The dreadnought acoustic guitar is a design that goes a long way back in the story of acoustic guitars. It was originally designed in 1916 by Martin Guitar Company for a retailer called Oliver Ditson Company. The product was discontinued until 1931 when Martin released the D-1. The dreadnought was designed for volume and bottom end which is superior to the smaller bodied guitars of the time - this guitar is no exception to the rule.
This guitar has a solid cedar top, meaning that is it very resonant and the top is able to breathe, as opposed to a guitar with a laminate wood top. This, matched with a big body results in lots of volume and tone which could not be achieved by a smaller instrument.