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XML is a markup language that programmers use to build format and store data. XML is quite similar to HTML but the tags you use are different. In html, you use predefined tags however in XML you use your own defined tags. XML elements must have a closing tag and must always be quoted.
XML tools would not process files with an error but will give you an error message for you to fix them.
JSON (JavaScript Object Notation) is a standard text-based format for representing structured data. This uses human-readable text to store and send data objects. It is derived from JavaScript and is a language-independent data format. JSON is useful when you want to transmit data across a network. To access these data, you would need to convert it to a native JavaScript object which is not that hard to do.
Asynchronous JavaScript and XML or also known as AJAX containts a set of techniques that helps in web development. There are a lot of features AJAX have that contributes a lot in web building, for example, this updates a web page without reloading the page. This helps the programmer to become efficient and effective.