[yocto] What does "virtual/" mean?

[Paul D. DeRocco]

I see lots of references to "virtual/kernel", as opposed to simply "kernel".
The bitbake docs show "virtual/whatever" and "virtual/package" in some of
its syntactic examples. But what does the "virtual/" prefix actually mean?
Google coughs up endless uses of the term, as though everyone knows what it
means, but no explanation of it.

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Ciao,               Paul D. DeRocco
Paul                mailto:pderocco at ix.netcom.com