Zygisk is a new feature in Magisk that provides a different way of running root apps and modules
Instead of running them as root, Zygisk creates a separate environment for these apps to run in. This environment is called the Zygote process, which is a system process in Android that is responsible for launching and managing app processes.
The Zygote process is the very first Android OS process that starts when you boot your phone. This is equivalent to the PID 1 process when you start a Linux based computer or server. Magisk allowing Zygisk to run at the boot level means it can have root access without sending that data to your apps.
By running root apps and modules in the Zygote process, Zygisk provides several benefits, including improved compatibility, security, and performance. Most importantly, your privacy focused apps like banking apps, Netflix, Google Play Movies etc. will not detect your rooted device and will continue to work like normal.