ELI5 Smallpox - is it related to monkeypox?

ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast

How is monkeypox related to smallpox? Why was it possible to eradicate smallpox, when it’s been impossible to do for other diseases? Why do vaccines owe their name to smallpox? What is cowpox? How does chickenpox fit into all this?

... 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: jimmiekosmo, afinkawan, meerkatmanor987, gingercunt101, prasiatko, mikeevans1990 and jefetoro1234

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