Do you mean in the film or in the real world? In the film, they were cloned from dinosaur DNA found in fossilized mosquitoes. In the real world, they were created with a combination of animatronics...
There were many dinosaurs. The velosoraptor, which was the one with the claws on its feet, the tyrannosaurus rex, which was the massive carnivore, the triceratops, this was the dinosaur with a shield...