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@ -192,10 +192,13 @@ This extension makes JSON more structable
GCD(Grand Central Dispatch) is a low-level API for managing concurrent operations. It can help you improve your app’s responsiveness by deferring computationally expensive tasks to the background.
### DispatchQueue
An object that manages the execution of tasks serially or concurrently on your app's main thread or on a background thread.
#### main
We can say main is a serial queue
#### global()
We can say global is a concurrent queue
### DispatchGroup