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XSL is a language for expressing style sheets. An XSL style sheet is, like with CSS, a file that describes how to display an XML document of a given type. XSL shares the functionality and is compatible with CSS2 (although it uses a different syntax). It also adds: 1  A transformation language for XML documents: XSLT.
The main difference between AJAX and JSON is that AJAX is a set of various technologies, which are used to launch asynchronous HTTP requests to a server using various data formats, such as JavaScript, XML, HTML, plain text or even JSON. JSON is a format which can be used by AJAX for data exchange.