How does this work?
Andronix is simple inside the hood (well, not really, but most of it is simple to understand). Andronix uses PRoot to run your favorite Linux distribution on your Android devices.
According to the official PRoot documentation
PRoot is a user-space implementation of chroot, mount --bind, and binfmt_misc. This means that users don't need any privileges or set up to do things like using an arbitrary directory as the new root file system, making files accessible somewhere else in the file system hierarchy, or executing programs built for another CPU architecture transparently through QEMU user-mode.
or in easier words, the benefits of enabling PRoot include running Linux operating systems in a Termux chroot (opens in a new tab) on an Android smartphone, tablet, and Chromebook.
We use Termux to provide the command line and the packages that are specially compiled for Termux implemented inside Andronix. We also use Proot to run the Linux distributions inside Termux. We use PulseAudio to provide sound support for the Linux distributions. We use XSDL and VNC to provide a graphical user interface for the Linux distributions.