Asynchronous JavaScript and XML - describes a pattern of web application development using JavaScript making communication requests and updating the page without full refresh. Traditionally data payloads were sent in XML, but today JSON tends to be used.
Cross Origin Resource Sharing ... blah blah blah
Blah blah blah
Short-hand way of referencing HTTP version 2. Also an <h2> tag in HTML
JavaScript Object Notation is a stringified form of JavaScript data types that is used to transmit and store information for easy consumption by JavaScript. It is not unique to JavaScript for data interchange, but it is most commonly used with it.
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Representation State Transfer ...
Same Origin Policy ... blah blah blah
Pronounced Speedy ... a form of HTTP/2
A device or program that makes HTTP requests, commonly a web browser such as Google Chrome, but may be a bot or other program. Derived from the User-Agent HTTP header.