Screensavers are moving, changing and rotating images that come on when computer monitors are left idle for a certain period of time. These came from use when Cathode Ray Tube monitors were in vogue before the Liquid Crystal Display or LCD monitors came in. The CRT monitors were subject to a burning effect when the computer screen was left on for an extended period of time. There was a tendency of a static image showing up or a ghostly replica of the same when the display was left on for a long time. The screen saver was configured as a program that came on when a computer screen was left idle for long; this helped to prevent the burning effect in CRT monitors.
Today LCD monitors are prevalent in computers and laptops and hence the burning effect is not found, though image persistence is something that does occur even in LCD monitors. There are polarized crystals that form when the same color is displayed on the screen for a long time. In order to prevent such effects, it is advisable that the display is turned off for a certain number of hours during the day or at night.
Even if image persistence is not as problematic as burn-in effects in CRT monitors, screen savers have certain other functions to offer as well, for which they have become popular and remain so even in modern computers. People can configure their screen saver applications to come on after a certain time period to enjoy the visual experiences they provide which are a break from the display of word documents, spreadsheets or web browsers. One can configure different kinds of screen savers as many are provided with the operating system. In other cases, one can also download different kinds of free screen savers from online sites. These could display different geometric patterns, could be underwater scenes, crisscross logos and other visuals. It is even possible to create screensavers with one’s personalized photos. If you are an avid follower of a website or a show, are a fan of a certain celebrity, theme or cause, you could find free screensavers that showcase such themes. That would help to show what your passion is to the rest of the world.