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XSL is used to refer to a family of languages used to transform and render XML documents. CSS is a style sheet language used for describing the presentation semantics (the look and formatting) of a document written in a markup language. Hence XSL and CSS are not the same and not interchangeable.
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.