I have initially searched in Stackoverflow and google for a similar type of question. Only one link(https://social.msdn.microsoft.com/Forums/en-US/3de8670c-49ca-400f-a1dc-ce3a3619357d/difference-between-multithreading-and-asynchronous-programming?forum=csharplanguage) gave some points,but I can't understand clearly.

The following questions haunts me:

1. In Asynchronous programming,What is real Callback method?is delegate?

2. The implent of async program is using multi threads?

If provided with graphics to explain, I would be very grateful，Thank you very much!!!

I have initially searched in Stackoverflow and google for a similar type of question. Only one link gave some points, but I can't understand clearly. [1]

The following questions haunts me:

1. In Asynchronous programming, what is real Callback method? is delegate?

2. The implent of async program is using multi threads?

If provided with graphics to explain, I would be very grateful

[1] "Difference between Multithreading and Asynchronous programming"