What is the difference between Memory, Real Mem, and Compressed Mem?

by dkv   Last Updated June 12, 2019 20:12 PM

I've already seen this question:

but I think it might be outdated. Specifically, there is a Memory column, as well as Real Mem and Compressed Mem column. What is the difference, and why would the Real Mem ever be smaller than Compressed Mem?

(I'm using macOS Sierra 10.12, but I think I've seen this in slightly older versions as well.)

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