Hindus believe the Brahman is the highest Universal Principle in the world. It is essentially the "material, efficient, formal and final cause of all that exists." To specify this, I will use this quote found on the internet, "It is the pervasive, genderless, infinite, eternal truth and bliss which does not change, yet it is the cause of all changes."
Hindu people believe Brahman was one of the first three gods of the universe. He created the world that is what Hindu people believe