Delphi is both an archaeological site and a modern town in Greece on the south-western spur of Mount Parnassus in the valley of Phocis.

In Greek mythology, Delphi was the site of the Delphic oracle, the most important oracle in the classical Greek world, and a major site for the worship of the god Apollo after he slew the Python, a deity who lived there and protected the navel of the Earth. Python (derived from the verb pythein, "to rot") is claimed by some to be the original name of the site in recognition of the Python that Apollo defeated. The Homeric Hymn to Delphic Apollo recalled that the ancient name of this site had been Krisa.

Apollo's sacred precinct in Delphi was a panhellenic sanctuary, where every four years, starting in 586 BC athletes from all over the Greek world competed in the Pythian Games, one of the four panhellenic (or stephanitic) games, precursors of the Modern Olympics. The victors at Delphi were presented with a laurel crown which was ceremonially cut from a tree by a boy who re-enacted the slaying of the Python. 

In the inner hestia ("hearth") of the Temple of Apollo, an eternal flame burned. After the battle of Plataea, the Greek cities extinguished their fires and brought new fire from the hearth of Greece, at Delphi; in the foundation stories of several Greek colonies, the founding colonists were first dedicated at Delphi