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Definition: application

(1) Software that is used for business or entertainment. The terms "application," "application program," "software application" and simply "app" may refer to virtually any type of program from spreadsheets such as Excel to media players such as iTunes to virtual reality games such as Second Life. However, the term specifically excludes essential control software such as the operating system (see system software).

One or Many Files
In the computer, an application can be made up of a single executable file or hundreds of files, which includes additional software modules, configuration files and ancillary data files. See application program and application software.

(2) A particular purpose for using technology; for example, "a banking application." An application can refer to a functional category such as payroll and billing or to a business category such as manufacturing and retail. It may also refer to scientific and medical categories. Using both #1 and #2 definitions, the phrase "this application is used in medical applications" is correct.