Multitasking is generally understood as the ability of an operating system to run several applications at once. While the definition is fairly simple, as we've seen with releases of Android OS and Apple iOS4, the reality can be significantly more complex.
While the basic idea behind multitasking is the same on your smartphone as it is on your PC, how it works--both under the hood and in terms of the interface--can be drastically different.
A Mobile Multitasking Primer
When it comes to mobile operating systems, "multitasking" is used to refer to two separate features: The ability to run applications in the "background" (that is, apps running behind the current app, as is the case on a PC), and the ability to save the state of apps to disk (effectively pausing them).
http://www.pcworld.com/article/199891/geek_101_android_and_ios_multitasking_compared.html
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