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What is the role of Grand Central Dispatch in multitasking on iOS?

I confuse these two concepts a bit when it comes to multitasking. I read that GCD makes effective use of all device cores and also makes it easier for application developers to make their applications multithreaded in a simpler way.

So, the questions that arise for me, like Apple's GCD, prefer to use multitasking? How is multitasking with GCD different from multitasking without GCD?

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