ELI5 Phobia - what's the difference between a phobia and a fear?

What two fears are we all born with? What is the most common phobia? Why are phobias categorized as specific and social phobias? Who are some famous people with phobias? ... we explain like I'm five Thank you to the r/explainlikeimfive community whose questions and comments formed the basis of this discussion. To the ELI5 community that has supported us so far, thanks for all your feedback and comments. Join us on Twitter: https://www.twitter.com/eli5ThePodcast/ or send us an e-mail: [email protected]