https://bsky.app/profile/anthonymoser.com/post/3myf5fwpl7s2t is a good explainer I think without getting into the nitty gritty details.

  for the non technical folks:  imagine there was a password that if you guess   it, you can impersonate *any website on the internet*
  
  now imagine the password is literally the number 4

This seems like the easiest way to frame it to non-technical people to me. They know what passwords are.