Sauron is the greatest fallen Maia, a former renowned disciple of Aulë, the chief agent of the first Dark Lord Morgoth in the Elder Days, the second Dark Lord, and the maker of the One Ring

At the end of the Second Age, Sauron caused the Downfall of Númenor, but was eventually defeated during the War of the Last Alliance of Elves and Men united under Gil-galad and Elendil. In the final battle, Isildur managed to cut the One Ring from his hand, destroying his corporeal form and robbing him of much of his power. After centuries of lying dormant and rebuilding his strength, Sauron returned to power late in the Third Age and again strove to dominate Middle-earth

While Sauron himself is a being of immense power, the Eye is a physical manifestation of his presence and his will. It's described as a flaming eye, often depicted with a slit pupil, and can be sensed by those who are close to the Ring or under Sauron's influence

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