A screen saver is a utility program that blanks the screen or fills it with moving images or patterns when the computer is not in use. Screen savers were originally used to prevent screen burn-in on CRT monitors.
Android devices don't have a dedicated screen saver feature, but there are a few ways you can simulate a screen saver. For example, you can download a screen saver app from the Google Play Store, or you can set a live wallpaper as your home screen. You can also set your device to sleep after a period of inactivity, which will turn off the screen and save battery power.