What role does Asynchronous JavaScript play in the AJAX methodology>?

Whoever said AJAX minimizes traffic?
Heck poorly written AJAX can cripple a server's resources.
You are still making requests to the server...

I suppose however, by only requesting the data which is to be changed - you do avoid having to retransmit information redundantly.
 
The whole point of AJAX is that you can update small portions of a web page without getting the entire page from the server. This is achieved through asynchronous HTTP calls to the server and dynamic updates of the HTML DOM. The asynchronicity allows this to happen without the user being blocked from using the web page. It cuts down on traffic because typically less data is moved around during an AJAX call since you are not updating the entire page, just a portion of it.
 
The whole point of AJAX is that you can update small portions of a web page without getting the entire page from the server. This is achieved through asynchronous HTTP calls to the server and dynamic updates of the HTML DOM. The asynchronicity allows this to happen without the user being blocked from using the web page. It cuts down on traffic because typically less data is moved around during an AJAX call since you are not updating the entire page, just a portion of it.
 
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