Help! What’s the Deal with VMs in Configs? I’m Confused!

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I've been looking for an answer to this but haven't found one. Many checkers or configs mention that they use a "VM" but I'm not sure what that means. I understand that a VM usually refers to a virtual machine, like VirtualBox, but I'm unclear if that's the same in the context of these configs/checkers or how it relates to them.
 
Can someone clarify what it means for a config to have a "VM inbuilt"? If it is indeed a "virtual machine," how does it connect to these configs? What is the purpose of using it in configs?

[2.605]

Virtual machine

[5.356]

XDDDDDDDDDDDD VIRTUAL MACHINE

VM = Valid Mail, this meaning that the config checks if the account it's registered on-site or not.

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[606]

Don't listen to alex, VM means valid mail, its checking if the email you input is registered to the site you are checking.

[7]

XDDDDDDDDDDDD VIRTUAL MACHINE

VM = Valid Mail, this meaning that the config checks if the account it's registered on-site or not.

 

Don't listen to alex, VM means valid mail, its checking if the email you input is registered to the site you are checking.

Thank you guys so much for explaining this to me and replying so fast, I appreciate it :)