Odds are you will never be asked to describe the Harry Potter books. This is mostly because everyone already knows what they are, and anyone who DOESN’T is very likely a space alien, which presents its own set of problems. (Are they friendly? Do they mean us harm? What’s the matter with them? Why haven’t they read Harry Potter?)
So, sure, you’ll probably never have to explain Harry Potter to anyone, and if called upon to do so you can simply widen your eyes and flail your arms around a lot in a way that hopefully conveys what the series means to you, in addition to millions of readers around the world.
Or you can, you know, just show them these pie charts.