polar vs nonpolar capacitors

I am interested in upgrading some audio components, and a lot of DIY tweak
mention "replace the electrolytics in the signal path with Black Gate or
other low-noise nonpolar capacitors." I know that polar capacitors cannot
tolerate reversed polarity, and that bi-polars can as they are really two
back-to-back capacitors. What is a non-polar? How is it different from a
bipolar?

Dave


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