A diagram showing how the operating system software and application software are layered on a typical desktop computers. The arrows indicate information flow.
·
Application software uses
the computer system to perform useful work or provide entertainment functions beyond
the basic operation of the computer itself.
·
System software is
designed to operate the computer hardware, to
provide basic functionality, and to provide a platform for running application
software. System software includes:
·
Operating system, an essential collection of
computer programs that manages resources and provides common services for other
software. Supervisory programs, boot loaders, shells and window systems are core parts of operating systems.
In practice, an operating system comes bundled with additional software
(including application software) so that a user can potentially do some work
with a computer that only has an operating system.
·
Device driver, a computer program that operates
or controls a particular type of device that is attached to a computer. Each
device needs at least one corresponding device driver; thus a computer needs
more than one device driver.
·
Utilities, software designed to assist users in
maintenance and care of their computers.
·
Malicious software or malware, computer software developed to harm and disrupt computers.
As such, malware is undesirable. Malware is closely associated with
computer-related crimes, though some malicious programs may have been designed
as practical
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