How long ago did dinasaurs exist?

The existence of dinosaurs spans a vast period of Earth's history, known as the Mesozoic Era. The Mesozoic Era is further divided into three periods: the Triassic, Jurassic, and Cretaceous. Dinosaurs first appeared during the late Triassic period, approximately 230 million years ago. They reached their peak diversity and dominance during the Jurassic and Cretaceous periods, which lasted from about 200 million years ago to 66 million years ago. The extinction of dinosaurs occurred at the end of the Cretaceous period, likely caused by a combination of factors including a massive asteroid impact and volcanic activity.