Chac was beneficent and a friend of man. He taught them how to grow vegetables and was the protector of their cornfields. The Maya appealed to him for rain by means of particular ceremonies by which the men would settle outside the village and adhere to strict observance of fasting and sexual abstinence. The animal associated with Chac is the frog, because it signals the coming of rain by its croaking.
He is also known as Ah Hoya ("he who urinates"), Ah Tzenul ("he who gives food to others"), and Hopop Caan ("he who lights up the sky").