The ancient Greek festival held every four years in honor of the god Zeus is known as the Olympic Games. Originating in Olympia in 776 BC, the games included a variety of athletic competitions, uniting the Greek city-states in a spirit of friendly rivalry. The Olympic Games were not only a showcase of athletic prowess but also served as a religious festival with sacrifices and prayers offered to Zeus. The tradition of the Olympic Games continues today, evolving into the modern Olympics, which are celebrated every four years across various countries, honoring athletic excellence and international unity.