While taking a look at this awesome thread I noticed that some examples use

PS1="Blah Blah Blah"

and some use

PROMPT_COMMAND="Blah Blah Blah"

(and some use both) when setting the prompt in a Bash shell. What is the difference between the two? A Stack Overflow search and even a bit of broader Google searching aren't getting me results, so even a link to the right place to look for the answer would be appreciated.

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