ELI5 Central Banks - do crypto currencies make them obsolete?

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

What does a central bank do? What’s the difference between a central bank, a reserve bank and a monetary authority? Why are some people against having a federal reserve? What is a CBDC, a central bank digital currency? How is it different to crypto currencies?

... 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: reingding13, yellowjacketcoder, ronquistador, rdavidson24, sakiliya, wrsaunders, litecow and cross_keynesian

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