On the basis of size, super, mainframe, mini and microcomputer.
Software
Software is a collection of data or computer instructions that tell the computer how to work. This is in contrast to physical hardware, from which the system is built and actually performs the work.
System software
A system software is a generic phrase referring to the computer programs used to start and run computer systems and networks. System software contrasts with application software, programming tools and malware. System software includes:
- Operating systems
- Device drivers
- Middleware
- Utility software
- Shellsand windowing systems
Application software
A application software is a group of programs designed for end users. Examples of an application include a word processor, a spreadsheet, an accounting application, a web browser, an email client, a media player, a file viewer, simulators, a console game or a photo editor.
Computer virus
It is a type of computer program that, when executed, replicates itself by modifying other computer programs and inserting its own code. When this replication succeeds, the affected areas are then said to be “infected” with a computer virus.
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