Ancient Greek religion was a polytheistic belief system centered around a pantheon of gods and goddesses, such as Zeus, Hera, and Athena. These deities were believed to influence various aspects of life, including nature, war, and love. Worship often involved rituals, sacrifices, and festivals, which were essential for gaining the favor of the gods. Temples, like the Parthenon in Athens, served as places of worship and were dedicated to specific deities. The Greeks also believed in the importance of oracles, such as the Oracle of Delphi, where priests would interpret messages from the gods, guiding individuals and city-states in decision-making.