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Computer software or simply software is any set of instructions that directs a computer to perform specific operations.
Computer software consists of computer programs, libraries and related non-executable data (such as online documentation or digital media).
Based on the goal, computer software can divided into:
System software, which is software that directly operates the computer hardware, to provide basic functionality needed by users and other software, and to provide a platform for running application software. System software includes:
Operating systems, which are essential collections of software that manage resources and provides common services for other software that runs “on top” of them. 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 drivers, which operate or control a particular type of device that attached to a computer. Each device needs at least one corresponding device driver; because a computer typically has at minimum at least one input device and at least one output device, a computer typically needs more than one device driver.
Utilities, which computer programs designed to assist users in maintenance and care of their computers.
Malicious software or malware, which is software that is developed to harm and disrupt computers. As such, malware is undesirable. Malware closely with computer-related crimes, though some malicious programs may designed as practical jokes.