What is Concurrency and various ways to achieve concurrency in iOS?

1.	What is Concurrency and various ways to achieve concurrency in iOS?
Answer» What is Concurrency and various ways to achieve concurrency in IOS? Concurrency is one of the fancy WAY to run several tasks at same time. In iOS devices concurrency commonly used when some running in background while doing our user interface sesnitive. For example we downloding some DATA and meanwhile doing some other operations. Now comes to DIFFERENT ways to achieve concurrency in iOS (1)Using Operations and OPERATION Queues (2)Using Grand Central Dispatch(GCD) (3)using threads

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