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a client-server software application in which the client (or user interface) runs in a web browser
With Ajax, web applications can send ...
... data to and retrieve from a server asynchronously (in the background) without interfering with the display and behavior of the existing page.
... using the XMLHttpRequest object.
Data can be retrieved ...
Despite the name, the use of XML is not required
JSON is often used in the AJAJ variant, and the requests do not need to be asynchronous
XMLHttpRequest Object (XHR)
an open standard format that uses human-readable text to transmit data objects consisting of attribute–value pairs. It is the primary data format used for asynchronous browser/server communication (AJAJ), largely replacing XML (used by AJAX).
a group of interrelated web development techniques used on the client-side to create asynchronous web applications. Unlike its predecessor AJAX, which uses XML
Ajax is not a technology, but a group of technologies