Validation is the process that a drug manufacturer uses to make sure that the drugs they are making are safe and will work correctly. They do this to make sure that the drugs they are making are going to be effective when used by people. To do this, they run tests on the drugs to make sure that all of the ingredients are safe to use in the drugs, that the drugs will work as intended, and that the drugs won't cause any unexpected side effects. Validation also includes making sure that the drugs are made in a clean and safe environment, and that only the highest quality materials are used in the manufacturing process.