Old School says Screensavers are to prevent burnout on your computer screen. Screensavers are now used primarily for entertainment, security or to display system status information."screen saver" is now something of a misnomer – the best way to save the screen (and also save electricity consumed by screen) would simply be to have the computer turn off the monitor.EntertainmentDespite the above flaws, screensavers have remained popular, and for good reason: they can be very entertaining. From slideshows of paradisiacal photographs to story-telling animations, among the thousands of available screensavers there is bound to be something for everyone. A screensaver can add to the festivity and decorations during the holidays, or add life and color to a room by projecting a virtual aquarium onto the screen.SecurityScreensavers can be password-protected, preventing anyone from accessing your computer once the screensaver has started. Some screensavers even perform a useful task, such as scanning your hard drive for viruses, or taking part in a distributed computing project, while others may be educational or offer news headlines.