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Software can be called the dynamic part of a device and the invariable part of the hardware. Software is often divided into application software (working users are specifically involved in programs) and system software (including operating systems and any application software supporting program). Sometimes the term middleware is used to describe programming that mediates between application and process software or between two different types of application software (e.g. sending a remote work request from an application on a computer that has one type of operating system to an application on a computer with another operating system).
A software is a general term for the various types of programs that are used to control computers and associated devices. (The word hardware defines the software and other devices ‘ physical aspects.)
An additional software classification, which is difficult to classify, is the utility, which is a small, usable program with limited capacity. Many services are fitted with operating systems. Utilities and software tend to be installable separately and able to be used independently of the rest of the operating system.
Applets are small apps that sometimes come as “accessories” with the operating system. They can also be developed separately using Java or other programming languages.
Software can be purchased or acquired as shareware (usually intended for sale after a trial period), liteware (shareware with disabled capabilities), freeware (free software but with restrictions on copyright), public domain software (free without restrictions) and open source (software where the source code is provided and users agree not to restrict the distribution of enhancements).
On CD-ROMs and diskettes, software is often bundled. Today, the Internet is downloading a lot of purchased apps, shareware, and freeware. A new trend is technology made available for use on another site known as a service provider for the program.
Some general kinds of application software include:
Productivity software, which includes word processors, spreadsheets, and tools for use by most computer users
Presentation software
Graphics software for graphic designers
CAD/CAM software
Specialized scientific applications
Vertical market or industry-specific software (for example, for banking, insurance, retail, and manufacturing environments).
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