Dinosaurs, also known as dinazorlar in Turkish, were a diverse group of reptiles that lived millions of years ago during the Mesozoic Era. They first appeared about 230 million years ago and became extinct around 66 million years ago.

Dinosaurs could be classified into two main groups: the Saurischia, which includes the theropods (such as Tyrannosaurus rex and Velociraptor) and the sauropodomorphs (such as Brachiosaurus and Diplodocus), and the Ornithischia, which includes herbivorous dinosaurs like Triceratops and Stegosaurus.

These ancient creatures came in various sizes, from small bird-like dinosaurs to massive giants like the long-necked and long-tailed sauropods. Some dinosaurs were carnivorous predators, while others were herbivores or omnivores.

The study of dinosaurs, known as paleontology, has provided invaluable insights into the Earth's history and evolution.