Understanding stage life characters

Who or what is an Antagonist and a Protagonist?
Do societies define hero, heroine & villains, do heroes and villains guide societies, or is there an absolute hero and a villain?
India is a land where antagonists and protagonists are worshipped equally. What’s your process of defining them?
What could be parameters to gauge a character since a very subjective thing? It’s a question to become a better audience?
If there is a gun in the first act then it should fire in the third. How true it is and how have you used it in your plays?

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