Tasks (refer to the Tasks section in Chapter 4, Control Flow) are independent units of code execution. Often, we want to start executing them, and then continue executing the main code without waiting for the task result. In other words, we want to start the task asynchronously. This can be done with the @async macro:
a = @async 1 + 2 # Task (done) @0x000000002d70faf0
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