What is theatre?

In my opinion theatre isn't a deep portrayal of someone's entertainment ideologies or someone's overly thought out explanation on why we like to watch plays. For me, it is simply life itself. I believe that theatre is simply an action and like every action there needs to be a reaction or it isn't an action at all, in my opinion. I believe that theatre is based off the fact that every person goes through billions of scenarios on a daily basis and many of these are portrayed into theatre and movie scripts or any other type of performance. I believe that all types of performance are based on someones life experience or someone's belief that occurs on a daily basis. Even pieces produced in experimental theatre are based off of someone's own personal experience whether it really did happen or not they are based off things many can relate to which is why I believe that theatre is life because that's the reason why it is so popular.