Zeus is the “Father of all Gods and Men”. He is known as Jupiter or Jove in Latin. He is the god of the sky, lightning and rain, and also of justice – protector of the weak and punisher of the wicked.
Accounts vary of Zeus’ birth and rise to power among the immortals, but his lineage is generally attributed to Cronos and Rhea in Crete. He overthrew Cronos and the Titans to become “King of the gods”, after which he was given domain over the sky by a random draw with his brothers Poseidon and Hades. Zeus married his sister Hera, and has children with multiple goddesses, nymphs, and mortals.
Zeus presides over various domains. Many natural (lightning, rain) and human-instigated (wars, betrayals) occurrences are credited to him, as well as the other classical deities that Zeus rules (such as Hera, Poseidon, Hades, and many others).
Although meetings between Zeus and other Olympian gods with mortals is recounted in stories such as Homer’s Iliad, no one has presented proof of meeting or seeing one of these deities.
It seems likely that Zeus and the other archaic deities were created by men in order to explain natural phenomena. In the absence of a scientific explanation for the origin of lightning, for example, mythological explanations satisfied many.
With our modern understanding of the source of lightning (put simply, a discharge of electricity based on an imbalance of the charge of the earth and the cloud floating above), the story that an immortal on a mountain in Greece throws lightning bolts is rather extraordinary.
All of the natural phenomena attributed to immortal Greek gods, including Zeus, is now explainable by knowledge gained over the last 2800 years. Since there is no evidence for the existence of Zeus, and some evidence against, it seems prudent to conclude that he does not exist beyond the imaginations and writings of the ancient Greeks.
Zeus on Theoi.com
Zeus on GreekMythology.com
Zeus on Godchecker.com