Computer Software System And Application Software

Computer software (or simply software) refers to one or more computer programs and data held in the storage of a computer for some purpose. Program software performs the function of the program it implements, either by directly providing instructions to the computer hardware or by serving as input to another piece of software. Data software exists solely for its eventual use by other program software.

The term software was first used in this sense by John W. Tukey in 1957; colloquially, the term is often used to mean application software. In computer science and software engineering, computer software is all information processed by computer system, programA computer program (often simply called a program is an example of computer software that prescribes the actions (" computations") that are to be carried out by a computer. Most programs consist of a loadable set of instructions which determines how the cs and data.

Computer software is often contrasted with computer hardware, which is the physical substrate on which software exists.

For other uses of the word software see Software (disambiguation)Software can refer to any of the following: Computer software In retailing, software refers to clothing. Downloading some software is a euphemism for defecating..

1 System and application software

2 Users see three layers of software

Users often see things differently. People who use modern general purpose computers (as opposed to embedded systems) usuallly see three layers of software performing a variety of tasks: platform, application, and user software.

Platform software: Platform includes the basic input-output system (often described as firmware rather than software), device drivers, an operating system, and typically a graphical user interface which, in total, allow a user to interact with the computer and its peripherals (associated equipment). Platform software often comes bundled with the computer, and users may not realize that it exists or that they have a choice to use different platform software.

Application software: Applications are what most people think of when they think of software. Typical examples include office suites and video games. Application software is often purchased separately from computer hardware. Sometimes applications are bundled with the computer, but that does not change the fact that they run as independent applications. Applications are almost always independent programs from the operating system, though they are often tailored for specific platforms. Most users think of compilers, databases, and other "system software" as applications.

User-written software: User software tailors systems to meet the users specific needs. User software include spreadsheet templates, word processor macros, scientific simulations, graphics and animation scripts. Even email filters are a kind of user software. Users create this software themselves and often overlook how important it is.

3 Software in operation

Computer software has to be "loaded" into the computer's storage (or memory).

Once the software is loaded, the computer is able to operate. Computers operate by executing the computer program. This involves passing instructions from the application software, through the system software, to the hardware which ultimately receives the instruction as machine code. Each instruction causes the computer to carry out an operation -- moving data, carrying out a computation, or altering the flow of instructions.

Kinds of software by operation: computer program as executable, source code or script, data, configuration.

4 Software creation

Software is created with programming languages and related utilities, which may come in several of the above forms: single programs like script interpreters, packages containing a compiler, linker, and other tools; and large suites (often called Integrated Development Environments) that include editors, debuggers, and other tools for multiple languages.

See also: Computer programming, Software engineering, Software architecture

5 Software patents

The issue of software patents is very controversial, since while patents protect the ideas of " inventors", they are widely believed to hinder software development.

6 Related articles

7 External links

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