This document discusses and provides examples of valid and invalid arguments. A valid argument has true premises that logically lead to a true conclusion. An example given is an argument in medical diagnosis that fulfills the criteria for a valid argument. An invalid argument is one where the premises could be true but the conclusion does not necessarily follow from them. An example of an invalid argument is provided, where the premises do not guarantee the conclusion that Johnny Depp is an actor even if he is a robot.