Answer:
Android system
Explanation:
We could create a mobile app and allow some settings, in this case, the user can personalize preference like notifications, color, volume, sounds, passwords. This depends on the kind of app.
For example:
There is some bank application that you can use a password or you can use your digital print, or in some apps where you can change the color, for example black, in this way, you can care your eyes.
