VMOS is a virtual machine app on Android, that can run another Android OS as the guest operating system. VMOS also gives the user the option to run the guest Android as a rooted Android OS. Also the guest Android operating has the Google Play Store and other Google apps.

VMOS is an APP software based on Virtual Machine (VM).
VMOS can be installed in the form of a normal APP to Linux or Android system through VM technology.
That is to run another complete Android system through an application.
Moreover, VMOS is not controlled by the host system. (Android on the phone).