Flynn hit nail on the head.
To add to what he said. It is written from the perspective of a Kender wizard (edit like what crazy pixie said) in a narative voice as a sort of field guide based on his travels and encounters. The dragon book covered topics like Dragon Anatomy, Combat, Lairs, Society, and Biology (for metallics and chromatics). IIRC all the art was used from previos D&D books like Dracomicon to allow the price to stay low (MSRP $14.95 US for a 64 pg Hard Cover) but the way it is presented is somewhat new with the story attached to it.
The monster book will do the same for things like Kobolds, Orcs, Gnolls, and more iconic D&D monsters like Beholders.