ELI5 ADHD - does it affect adults?

Is there a difference between ADD and ADHD? Does ADHD affect adults? How is it not just being hyper active? What goes on in the brain of someone with ADHD? Why do some people not believe in ADHD? What makes video games and people with ADHD a perfect fit?

... we explain like I'm five

Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: mrsrainey, professional-eye-878, 4102reddit, craftybeerdad and oogieboogieboogieboo

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