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Here is some information about The Watchers from Wikipedia.

In the Book of Enoch, the watchers are angels dispatched to Earth to watch over the humans. They soon begin to lust for human women, and at the prodding of their leader Samyaza, they defect en masse to illicitly instruct and procreate among humanity. The offspring of these unions are the Nephilim, savage giants who pillage the earth and endanger humanity.

Samyaza and associates further taught their human charges arts and technologies such as weaponry, cosmetics, mirrors, sorcery, and other techniques that would otherwise be discovered gradually over time by humans, not foisted upon them all at once. The Greek myth of Prometheus revealing fire-making to humans without Zeus's permission is likely a variant of the same ancient legend, and it is possible also that ancient legends among many cultures about cannibalistic giants and pervasive implementation of magical powers (such as in the tale Jack and the Beanstalk) arise from the same ancient mythology that came to inspire the Books of Enoch.

Eventually God allows a Great Flood to rid the earth of the Nephilim, but first sends Uriel to warn Noah so as not to eradicate the human race. While Genesis tells us that the Nephilim remained "on the earth" even after the Great Flood, Jude tells us that the Watchers themselves are bound "in the valleys of the Earth" until Judgment Day.