In this video we will learn how to properly use background threads, also known as background queues. By default, all of the code that we write in our apps is executed on the "main thread", however, if the main thread ever gets overwhelmed with tasks, it can slow down, freeze, or even crash our app. Luckily, Apple provides us with easy access to many other threads that we can use to offload some of the work!
We will review how to add different threads, how to perform tasks on a background thread, and how to return back to the main thread afterward. As we get into the second half of this course, we will begin to use background threads more often as we begin to do data intensive tasks, such as downloading data from the internet.
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