They were created on a watery world Kamino, which had the best cloning facilities known.
The only clone that was not like the others was Boba Fett, clones without differences he was grown at the same rate that a normal human would and he didn't have to obey orders if he didn't want to. They were grown to obey orders without question, no matter what they were, unless someone of higher authority vetoed it. They were grown at twice the rate of normal humans and most had unwavering loyalty to the Senate, and the Chancellor.
Clone troopers were clones of a template, a Mandalorian bounty hunter named Jango Fett, that were created to serve the Galactic Senate.
