Hermes is the great Messenger of the gods in Greek mythology as well as a guide to the Underworld. An Olympian god, he is also the patron of boundaries and of the travelers who cross them, of shepherds and cowherds, of thieves and road travelers, of orators and wit, of literature and poets, of athletics, of weights and measures, of invention, of general commerce, and of the cunning of thieves and liars.^[1] His symbols include the tortoise, the cock, the winged sandals, and the caduceus. In the Roman adaptation of the Greek religion (see interpretatio romana), Hermes was identified with the Roman god Mercury, who, though inherited from the Etruscans, developed many similar characteristics, such as being the patron of commerce.

The Homeric hymn to Hermes invokes him as the one "of many shifts (polytropos), blandly cunning, a robber, a cattle driver, a bringer of dreams, a watcher by night, a thief at the gates, one who was soon to show forth wonderful deeds among the deathless gods."

He protects and takes care of all the travelers, miscreants, harlots, old crones and thieves that pray to him or cross his path. He is athletic and is always looking out for runners, or any athletes with injuries who need his help. Hermes is a messenger from the gods to humans, sharing this role with Iris. An interpreter who bridges the boundaries with strangers is a hermeneus. Hermes gives us our word "hermeneutics" for the art of interpreting hidden meaning. In Greek a lucky find was a hermaion. Hermes delivered messages from Olympus to the mortal world. He wears shoes with wings on them and uses them to fly freely between the mortal and immortal world. Hermes was the second youngest of the Olympian gods, being born before Dionysus.

Hermes, as an inventor of fire, is a parallel of the Titan, Prometheus. In addition to the lyre, Hermes was believed to have invented many types of racing and the sport of wrestling, and therefore was a patron of athletes.

According to prominent folklorist Yeleazar Meletinsky, Hermes is a deified trickster.^[5] Hermes also served as a psychopomp, or an escort for the dead to help them find their way to the afterlife (the Underworld in the Greek myths). In many Greek myths, Hermes was depicted as the only god besides Hades, Persephone, Hecate, and Thanatos who could enter and leave the Underworld without hindrance.

Hermes often helped travelers have a safe and easy journey. Many Greeks would sacrifice to Hermes before any trip.

In the fully-developed Olympian pantheon, Hermes was the son of Zeus and the Pleiade Maia, a daughter of the Titan Atlas. Hermes' symbols were the cock and the tortoise, and he can be recognized by his purse or pouch, winged sandals, winged cap, and the herald's staff, the kerykeion. Hermes was the god of thieves since he was very cunning and shrewd, as well as a thief himself from the night he was born; he slipped away from Maia and stole his elder brother Apollo's cattle.