AJAX or Asynchronous JavaScript and
XML is a term describing a web development technique for creating
interactive web applications using a combination of:

  • HTML (or XHTML) and CSS for presenting information
  • The Document Object Model manipulated through JavaScript to dynamically display and interact with the information presented
  • The
    XMLHttpRequest object to interchange and manipulate data asynchronously
    with the web server (commonly using XML and XSLT, although AJAX
    applications can use other technologies, including preformatted HTML,
    plain text, JSON and JSON-RPC as alternatives to XML/XSLT).
  • Like
    DHTML, LAMP, or SPA, AJAX is not a technology in itself, but a term
    that refers to the use of a group of technologies together. In fact,
    derivative/composite technologies based substantially upon AJAX, such
    as AFLAX are already appearing.

Full Tutorials here.

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