As I was typing this question I
realized that it might be an abbreviation
for (Volume License). Could you please confirm this
That is correct.
or let me know what VL Build actually means.
VL Builds work with VLKs (Volume License Keys).
Volume license keys can be used to activate multiple installations of the software without any mechanism (such as a product activation mechanism) checking the total number of installations.
The license for the software will place restrictions on the use of the key. Typically the licence will limit the key to a fixed number of installations which must only be within the licensee's organisation and also place the licensee under an obligation to keep a record of the number of installations, keep the key confidential and possibly even require that the licensee organisation makes itself available for a software licensing audit to verify that its use of the key is within the terms of the licence. If a volume licence key becomes known and used outside of the organisation it is licensed to then this is regarded as software piracy.