To install as a Progressive Web App (PWA) on your mobile, with Chrome, click The Three Dots and then Install App. With Edge, Click The Three Bars then Add To Phone. With Firefox Click The Three Dots then Install. With Safari, Click The Share Button then Add To Home Screen (Scroll down the popup). No need to visit Play Store or App Store.
Virtual Universes and Virtual Worlds are created from imagination and are not real.
These Universes and Worlds can be both educational and entertaining.
Many computer / mobile / console games have Virtual Universes within the game that can be very large.
Acquivision is currently working on a Virtual Universe that is both Educational and Entertaining.