At the top you have the Brahmins, the priests, the scholars, and the teachers. Then the next you have the kings and the warriors, referred to as the Kshatriyas. Then the Vaishyas, who are the farmers, the merchants, the artisans. And then the Shudras, the laborers. Now, some historians and Vedic scholars believe that these reference to the varnas were added after the Vedic period to things like the Rig Veda. And some believe that these weren't traditional castes as it's sometimes perceived today, but just a reference to different social strata, that it wasn't necessarily inherited. We are not actually sure about that.