Vl's are created in Calibre using a the search syntax (or from a Saved Search that exists) . (click on the Virtual Library button to see options. Read the Online help to sort those out)
The VL can be exposed as a Tab for quick access
One advantage is Onions (Thank you Shrek for the layer analogue)
Normally (full library) only 1 saved search can be active at a time.
With a VL active, you can still use a saved search. In this case it applies to the restricted VL view
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