Why would you need to "zero out" more than once?

Sorry if this is a dumb question, but I have always wondered why a hard drive would need to be written over more than once for better security?
If it is writing ALL zeros what is there left to find? I just don't get it.
Thanks,
Curious Tom

Hello! A random write could leave a few bits that might be salvadged while the "zero all data" maps out bad blocks and writes all zeros. Once should be enough. Tom

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