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What is the difference between serial and concurrent queues?

Serial: one closure at a time


Concurrent: multiple threads servicing the queue

What are the restrictions for the main queue?

All UI updates must happen on main queue.


Time-consuming non-UI activity should happen off the main queue

How do you get a reference to the main queue?

DispatchQueue.main

How do you get a global or background queue?

DispatchQueue.global(qos: DispatchQos)