Hermes is also known with his Latin name Mercury.
He is the son of Zeus(Jupiter) and Maia. He is mainly known as the Messenger of the gods and is usually depicted wearing winged sandals and hat and holding a winged staff with 2 intertwining snakes called the Caduceus(Lt) or Kerykeion(Gr.). But he was also known as the god of knowledge (astronomy, medicine science e.t.c), commerce, thieves, protector of the travelers and the guide of the dead to the underworld.
In Homer's Odyssey Hermes is the grandfather of Odysseus.
Aesop also mentions Hermes in his fables, as the ruler of the gate of prophetic dreams and as the god who assigned the appropriate amount of intelligence to each person. He is also mentioned as the god of athletes, health, and of hospitality
Note: Hermes is not to be confused with Asclepius (father of Medicine). He was the son of Apollo and a human woman, Coronis. He raised by Chiron the centaur who instructed him in the art of medicine. Asclepius is usually depicted with a staff with one entwined snake. This staff later became associated with healing and medicine in general.
To the Greeks (and many ancient civilizations) snakes were sacred beings of wisdom, healing, and resurrection.
Remember the two snakes with the winged staff represent Hermes-Mercury and the staff with NO wings and one snake represent Asclepius.