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Screensavers
A screensaver is a computer program originally designed to conserve the image quality of computer displays by blanking the screen, or filling it with moving images or patterns when the computer was not in use. Today, screensavers are primarily used for entertainment or security purposes.
Wall papers
The screensaver is also an outlet for the work of creative computer programmers. The UNIX-based screensaver XScreenSaver collects the display effects of other UNIX screensavers, which are termed "display hacks" in the jargon file tradition of US computer science academics. It also collects forms of computer graphics effects called demo effects, originally included in demos created by the demo scene.
Computer Screensavers
Monitors running screensavers consume the same amount of power as when running normally, which can be anywhere from a few watts for small LCD monitors to several hundred for large plasma displays. Most modern computers can be set to switch the monitor into a lower power mode, blanking the screen altogether. A power saving mode for monitors is usually part of the power management options supported in most modern operating systems, though it must also be supported by the computer hardware and monitor itself.
XS Screensavers
Screensavers are not to be confused with power management features, which place the computer in a low power state after it has been idle for a specified amount of time. In fact, screensavers can actually waste power, because they can prevent the computer from entering the lower power (or sleep) state, and they often cause the CPU and GPU to perform more calculations, and keep the hard disk running for longer than if the computer were idle.
UNS Screensavers
After Dark was an early screensaver for the Macintosh platform, and later PC/Windows, which prominently featured whimsical designs such as flying toasters. Perhaps in response to the workplace environment in which they are often viewed, many screensavers continue this legacy of whimsy by populating the idle monitor with animals or fish, games, and visual expressions of mathematics equations such as fractals.
The ability of screensavers to divert and entertain is used for promotional purposes, especially to build buzz for "event-based" products such as feature films.
The screensaver is also an outlet for the work of creative computer programmers. The UNIX-based screensaver XScreenSaver collects the display effects of other UNIX screensavers, which are termed "display hacks" in the jargon file tradition of US computer science academics. It also collects forms of computer graphics effects called demo effects, originally included in demos created by the demo scene