How do you get your plane tickets if you booked online?

If I book flight tickets on Expedia, for example, I'll still have to show them my boarding pass before getting on the plane.
How do you get your plane tickets if you booked online?

But how do I get them? Is there some kind of machine in the airport that prints them? Or do I need to talk with someone in there? I have never been on a plane or been at an airport before, so I don't know.
How do you get your plane tickets if you booked online?
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