Virtual RAM operates as additional RAM for your other apps to run smoothly. If your device has 4GB of physical RAM, an additional 2GB of Virtual RAM will make your overall RAM at 6GB. As the name suggests, "Virtual" RAM isn't present at the physical RAM of your smartphone but in your internal storage instead.
Ultimately, Virtual RAM will help you in running different apps altogether to ensure that you can go back from one app to another as smoothly as possible. This will be beneficial for your gaming apps, so I suggest you use it on what works for you best.
