What does the word “middleware” mean in the TrueNAS context

Coming from the personal computing world I am a bit foggy what “middleware” means. What do TrueNASers refer to as “middleware?”

The GUI is the face, the part you see and interact with.
The middlewared(aemon) is part of the plumbing that takes your clicks in the GUI and makes it happen, running zfs commands and the like as appropriate, acting as a go-between.

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In the Open NAS Alliance roundtable straw poll, “go-betweenware” was a close second, only 4 votes less than “middleware”.

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