Self-made billionaires: How they started

http://www.msn.com/en-in/money/business/self-made-billionaires-how-they-started/ss-AA8SJ2H#image=1

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Modes in which application runs

For what I’ve been reading, there are 3 running modes.

Foreground: when you are using the application.
Background: when you have the application minimized but not closed and you can restore it where you left it before minimizing.
Back-background: when you have closed your application but there are a service generated by the application that is listening some specific events (i.e. waiting push notifications).