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A screen saver, a type of computer program, is such an animated image which is activated on a computer display when no mouse or keystrokes or any kind of movement has been sensed to the computer for certain duration. It is originally designed and used to prevent Phosphor burn in (screen burn) on cathode ray tube (CRT) as well as plasma monitors by blanking the computer screen or filling the screen with a moving image, icon, logo or patterns.

Screen saver may be used as a rudimentary security purpose. There is a lot of screensavers can be configured by you to ask operators for a password (secret code) before permitting one to do resume work. Moreover, one might be able to evade the password (secret code) by restarting the PC if the possessor of the computer has set one account to automatically log in upon when startup.

An ideal screensaver must have some characteristics such as a dark background or sight for saving power consumed by the screen, moving objects or image for avoiding pixel burning on the other hand fixed objects or scene must be dark, the image or scene must be slow motion for appeasing, it should be sensitive such as mouse move, key board hit and click or any kind of user action it must stop. A good screen saver must be silent but if you want to add sounds then use low-level and cool composition or cool music.

When you purchase a computer, there is an operating system installed for you. You can select any screensaver from already installed of your computer. You may select screensaver by selecting start menu > setting > control panel > display > screensaver. Nowadays screensavers are used for entertainment. There is various type of screensaver such as animal, fish, celebrities, natural scene, famous spot as well as Christmas screensavers. There are many company provide you free screensavers for your computer. You may search in the web and download those to get more attractive screensaver for your computer display.