noun – a computer program built for a specific operating system. Instead of ‘reinventing the wheel’ and designing a program starting with nothing, an app (short for computer application) starts with a common operating system to take care of the basics.

The operating system is the foundation on which apps are built. Because apps use the shortcut of starting with a certain (usually widespread) operating system, the app is built FOR that operating system only and works ONLY on that operating system.

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