Key pieces to understand Async and await

• Async code can be used for both I/O-bound and CPU-bound code, but differently for each scenario.
• Async code uses Task<T> and Task, which are constructs used to model work being done in the background.
• The async keyword turns a method into an async method, which allows you to use the await keyword in its body.
• When the await keyword is applied, it suspends the calling method and yields control back to its caller until the awaited task is complete.
• await can only be used inside an async method.