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I guess we've reached the fairy believing science hater posts. And nobody has answered the question other than "K-T event, EOT."
Actually, it's been explained multiple times: a line of maniraptora theropod Dinosaurs evolved gliding and then flight capacity sometime in the later Jurassic and became modern Aves. These animals still exist with over 1500 distinct species. So, no, Dinosaurs are not extinct but live with us and among us. Nonavian Dinosaurs died out following a cataclysmic meteor impact. To give you an idea of how devastating this impact was, one theory suggests that the ejected particulate crystalized and burned up in the atmosphere, leading to global temperatures of over 700 degrees in a few hours after impact, essentially cooking anything alive on land that did not have some form of natural cover.