What are considered steriods????

What exactly do steroids pertain to? Any drugs that help you get stronger? What about how catchers drink 5 cups of coffee before a baseball game? Would that be considered cheating in a game? Should that be put down as steroids? What about Gatorade? On the commercials it says that Gatorade makes you proform better in physical activites? Is that a steriod? What do you think?