!!! Overview
[{$pagename}] (also [AJAX], short for "[asynchronous|Asynchronous Operation] [JavaScript] and [XML]") is a set of [Web] development techniques using many Web technologies on the [client-side] to create asynchronous Web applications. [{$pagename}] 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. By decoupling the [data] interchange layer from the presentation layer, [{$pagename}] allows for [Single-Page Applications].  In practice, modern implementations commonly most [Single-Page Applications] substitute [JSON] for [XML] due to the advantages of being native to [JavaScript].

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[Fetch API] provides an interface for fetching resources and provides a better alternative that can be easily used by other technologies such as [Service Workers]. 
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!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [XMLHttpRequest|Wikipedia:XMLHttpRequest|target='_blank'] - based on information obtained 2017-10-11-