An analogy of synchronous asynchrony

On the Internet to see the synchronous asynchronous interpretation, feel very image, reproduced come to remember.

The difference between synchronous and asynchronous

For example: Ordinary B/s mode (synchronous) Ajax Technology (asynchronous)

Synchronization: Submit request, wait for server processing, processing completed returns this period the client browser cannot do anything

Asynchronous: Requests are processed through event triggering server processing (which is still something the browser can do)

Synchronization is when you ask me to eat, I hear you go to dinner, if not heard, you keep barking until I tell you to hear, to go to dinner together.

Async is you call me, and then go to dinner, I can get the news immediately, may wait until after work to eat.

So, if I ask you to eat in a synchronized way, ask me to eat with the Async method, so you can save money.

For example, a call is a synchronous message that is asynchronous

An analogy of synchronous asynchrony