A screensaver is a computer program that blanks the screen or fills it with moving images or patterns when the computer has been idle for a long time. The original purpose of screensavers was to prevent phosphor burn-in on CRT, plasma, and OLED computer monitors (hence the name). While screen savers are not entirely necessary anymore, many users prefer them to keep a computer secure while they're away or allow them to view a slideshow of their favorite photos. Here we’ll show you How to Enable and Disable the Screensaver in Windows and MacOS. To proceed, choose your operating system from the list below and follow the instructions.