There were more than 700 different types of dinosaur.
They are often classified as either meat-eaters (carnivores) like Tyrannosaurus Rex, or plant-eaters (herbivores) like Triceratops.
Dinosaurs all looked different. Some walked on two legs and others walked on four.
Some were very fast like Velociraptor but some were slow and lumbering.
Some had horns and spikes, or bumpy skin. But no one actually knows what colour or pattern dinosaurs were.