No, it's more like a technique. You have to take 3 or more photos of different exposures of the same thing, from the same angle (so using a tripod would really help) and then merging them together in an application. Like, for example Photomatix. After merging there some sort of editing called tone-mapping that works with the different kinds of details offered by the varying exposures To get more or less actual detail in the final photo. Well that's about it, long story short.