The Vedas describe Brahma as the first created entity within the universe.
Krishna's avatar for bringing the material world into being, Vishnu, empowers Brahma to create the universe and rule over it. Of all the demigods in charge of generating various species of life and managing universal affairs, Brahma is the chief.
Brahma is also the original spiritual mentor of everyone within the universe. Krishna entrusts him with the sum total of all knowledge—the Vedas—by which everyone can attain success in life and ultimately return to the spiritual world. Brahma, in turn, ensures that Vedic knowledge is spread everywhere by his representatives. This mission is known as the Brahma-sampradaya, or school of theistic thought originating from Brahma.