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I haven’t read the article but I work with Bloom filters at work sometimes.

Bloom filters basically tell you “this thing might be present” or “this thing is definitely not present”.

If you’re looking for a piece of data in a set of large files, being able to say “this data is definitely not in this file” saves you a bunch of time because you can skip over the file instead of searching through the whole thing just to figure out what you’re looking for isn’t there.