AJAX stands for Asynchronous JavaScript And XML. It is based on JavaScript and HTTP requests.
Ajax is a catchy name for a type of programming made popular in 2005 by Google and other big web developers.

The Ajax technique accomplishes by using the following technologies:

Features of AJAX:
  •  JavaScript that allows for interaction with the browser and responding to events
  •  The DOM for accessing and manipulating the structure of the HTML of the page
  •  XML, which represents the data passed between the server and client.
  •  An XMLHttpRequest object for asynchronously exchanging the XML data between the client and the server.

The following graphic shows how these technologies work together to update a piece of a page with new data from the server.

Features of AJAX:
  •  AJAX is not a new programming language, but a technique for creating better, faster, and more interactive web applications.
  •  With AJAX, your JavaScript can communicate directly with the server, using the JavaScript XMLHttpRequest object. With this object, your JavaScript can trade data with a web server, without reloading the page.
  •  AJAX uses asynchronous data transfer (HTTP requests) between the browser and the web server, allowing web pages to request small bits of information from the server instead of whole pages.
  •  The AJAX technique makes Internet applications smaller, faster and more user-friendly.
  •  AJAX is a browser technology independent of web server software.
Ajax is a way of developing Web applications that combines:
  •  XHTML and CSS standards based presentation
  •  Interaction with the page through the DOM
  •  Data interchange with XML and XSLT
  •  Asynchronous data retrieval with XMLHttpRequest
  •  JavaScript to tie it all together
Places To Use Ajax:
  •  Form driven interaction.
  •  Deep hierarchical tree navigation.
  •  Rapid user-to-user communication.
  •  Voting, Yes/No boxes, Ratings submissions.
  •  Filtering and involved data manipulation.
  •  Commonly entered text hints/autocompletion.
  •  Long Running Queries/Remote Calls
  •  Computationally Expensive Operations
  •  Server Savings
  •  Interactive Panning And Moving Over Data
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