So I see on a lot of people's resumes they list AJAX in their technologies (or programming languages - and I recognize that it is not a language). To me, AJAX seems like such a small concept to be individually listed. It seems it is almost as useful as listing MVC experience (because MVC too is a concept), which is good to know, but AJAX, like MVC, is just a facet of one's abilities as a developer. However, saying I know AJAX seems like it is much smaller thing than saying I know MVC.What does saying I know AJAX actually cover?To me, it seems like you are saying, I know how to use JavaScript to send of an asynchronous call (via some data format like XML or JSON) to a web endpoint, and use the endpoint's response to manipulate a web page's DOM for visual effects and data.The wikipedia page on AJAX lists just  a few more things, but I'd love to ask the community... am I missing a key concept about AJAX? If not, it seems like that listing it on a resume is just fluff.
AJAX - What exactly does that encompass?
javascript;ajax
You are thinking like a programmer. Instead, try to think like a Human Resources Director.Senior Developer to Human Resources Director: We need to hire a web developer.HRD: Okay, what skills do they need to have?SRD: Well, PHP, Javascript, MVC frameworks, git...HRD: Anything else?SRD: Well, experience with AJAX would be a plus...Adding technologies like AJAX into resumes works as grease to facilitate Human Resources filtering out potential job applications and to write accurate job listings.Otherwise, you are correct. If I were hiring a web developer, I would assume that PHP + Javascript on a resume would imply having written code with asynchronous calls. But I would still ask during an interview if it wasn't explicitly stated.