Explain Like I'm Five | Don't Panic!

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The original was posted on /r/explainlikeimfive by /u/Cerusin on 2023-10-03 15:34:27.

Tv and movies show them as a magical heart restart machine, bringing people back from the dead. But I’ve heard medical professionals say that’s not true, but they never elaborate. I’ve seen portable ones everywhere, so they must be needed fairly regularly.