What is JSON?

Question

what it does exactly?is it a language? do I have to learn it?

Answer 1

It is a format that uses readable text to transmit data objects using attributes and their values. It is used for asynchronous server-browser communication also known as AJAX. If you want your web app to work without reloading pages - you have to learn it.

Answer 2

JSON stand for JavaScipt Object Notation.
Not a language, but a syntax to textual data encoding wich is become standard ( means that's supported in most of languages even it comee from JS originally ) format to data exchange, as well as the other textual data syntaxic convention of namming, XML.

JSON can be use in AJAX, as it is a useful text format encoding, but originally AJAX stand for Asynchronious Javascript And Xml: the fundamental JS object to handle AJAX request was called 'XMLHttpRequest' ( created by microsoft, followed by mozilla ) even if it basically handle any text format, as well json, html or plain text ^^