APP is an abbreviation for application. The filename extension .app means application in Windows (via AppWave), iOS, Symbian OS, SkyOS, GNUstep and Mac OS X. On the latter two systems, a .app file is actually a folder containing binaries and supporting files.^[1]. On Windows, AppWave from Embarcadero supplies the support to run .app Windows binaries.

App may also refer to a lightweight application, tailored to a device's form factor and input-output interfaces (key pad, touch pad, remote control, display, etc). Devices may include such things as a mobile phone, a TV set, a cable or satellite receiver, a tablet PC, a printer - any device whose features can be extended through software.

See also

• Application bundle (in Mac OS X and GNUstep)
• Mobile application development
• SIS (file format), Symbian installation source for APP and other files
• Symbian OS
• Symbian Ltd.
• Super OS (RUNZ)

References

pt:App