. Ajax programming uses JavaScript to upload and download new data from the web server without undergoing a full page reload.

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The data fetched by an Ajax request is typically formatted in XML or JSON (JavaScript Object Notation) format, two widely used structured data formats. Since both of these formats are natively understood by JavaScript, a programmer can easily use them to transmit structured data in their web application. When this data is received via Ajax, the JavaScript program then uses the Document Object Model (DOM) to dynamically update the web page based on the new data, allowing for a rapid and interactive user experience. In short, using these techniques, Web designers can make their pages function like desktop applications. For example, Docs uses this technique to create a Web based word processor.

Adobe Flex is another technology often used in Web 2.0 applications. Compared to JavaScript libraries like jQuery, Flex makes it easier for programmers to populate large data grids, charts, and other heavy user interactions.[22] Applications programmed in Flex, are compiled and displayed as Flash within the browser. As a widely available plugin independent of W3C (World Wide Web Consortium, the governing body of web standards and protocols) standards, Flash is capable of doing many things that were not possible pre-HTML5, the language used to construct web pages. Of Flash's many capabilities, the most commonly used in Web 2.0 is its ability to play audio and video files. This has allowed for the creation of Web 2.0 sites where video media is seamlessly integrated with standard HTML. HTML5 has also been proven to decrease the amount of computer resources required compared to Adobe’s Flash. Specifically, Apple Inc. has demonstrated the use of Flash on mobile devices decreases the battery’s lifespan significantly. Adobe has then announced that they will no longer publish future public versions of the mobile Flash plugin.[23].

In addition to Flash and Ajax, JavaScript/Ajax frameworks have recently become a very popular means of creating Web 2.0 sites. At their core, these frameworks do not use technology any different from JavaScript, Ajax, and the DOM. What frameworks do is smooth over inconsistencies between web browsers and extend the functionality available to developers. Many of them also come with customizable, prefabricated 'widgets' that accomplish such common tasks as picking a date from a calendar, displaying a data chart, or making a tabbed panel.

On the server side, Web 2.0 uses many of the same technologies as Web 1.0. Languages such as PHP, Ruby, Perl, Python, JSP, and ASP.NET are used by developers to output data dynamically using information from files and databases. What has begun to change in Web 2.0 is the way this data is formatted. In the early days of the Internet, there was little need for different websites to communicate with each other and share data. In the new "participatory web", however, sharing data between sites has become an essential capability. To share its data with other sites, a website must be able to generate output in machine-readable formats such as XML (Atom, RSS, etc.) and JSON. When a site's data is available in one of these formats, another website can use it to integrate a portion of that site's functionality into itself, linking the two together. When this design pattern is implemented, it ultimately leads to data that is both easier to find and more thoroughly categorized, a hallmark of the philosophy behind the Web 2.0 movement.

In brief, Ajax is a key technology used to build Web 2.0 because it provides rich user experience and works with any popular browser whether, including: Firefox, Chrome, Internet Explorer, etc. Then, a language with very good web services support should be used to build Web 2.0 applications. In addition, the language used should be iterative meaning that the addition and deployment of features can be easily and quickly achieved.

[edit] Concepts

Web 2.0 can be described in 3 parts, which are as follows:

As such, Web 2.0 draws together the capabilities of client- and server-side software, content syndication and the use of network protocols. Standards-oriented web browsers may use plug-ins and software extensions to handle the content and the user interactions. Web 2.0 sites provide users with information storage, creation, and dissemination capabilities that were not possible in the environment now known as "Web 1.0".

Web 2.0 websites include the following features and techniques: Andrew McAfee used the acronym SLATES to refer to them:[24]

Search
Finding information through keyword search.
Links
Connects information together into a meaningful information ecosystem using the model of the Web, and provides low-barrier social tools.
Authoring
The ability to create and update content leads to the collaborative work of many rather than just a few web authors. In s, users may extend, undo and redo each other's work. In blogs, posts and the comments of individuals build up over time.
Tags
Categorization of content by users adding "tags"—short, usually one-word descriptions—to facilitate searching, without dependence on pre-made categories. Collections of tags created by many users within a single system may be referred to as "folksonomies" (i.e., folk taxonomies).
Extensions
Software that makes the Web an application platform as well as a document server. These include software like Adobe Reader, Adobe Flash player, Microsoft Silverlight, ActiveX, Oracle Java, Quicktime, Windows Media, etc.
Signals
The use of syndication technology such as RSS to notify users of content changes.

While SLATES forms the basic framework of Enterprise 2.0, it does not contradict all of the higher level Web 2.0 design patterns and business models. In this way, a new Web 2.0 report from O'Reilly is quite effective and diligent in interweaving the story of Web 2.0 with the specific aspects of Enterprise 2.0. It includes discussions of self-service IT, the long tail of enterprise IT demand, and many other consequences of the Web 2.0 era in the enterprise. The report also makes many sensible recommendations around starting small with pilot projects and measuring results, among a fairly long list.[25]

[edit] Usage

A third important part of Web 2.0 is the social Web, which is a fundamental shift in the way people communicate. The social web consists of a number of online tools and platforms where people share their perspectives, opinions, thoughts and experiences. Web 2.0 applications tend to interact much more with the end user. As such, the end user is not only a user of the application but also a participant by:

The popularity of the term Web 2.0, along with the increasing use of blogs, s, and social networking technologies, has led many in academia and business to coin a flurry of 2.0s,[26] including Library 2.0,[27] Social Work 2.0,[28] Enterprise 2.0, PR 2.0,[29] Classroom 2.0,[30] Publishing 2.0,[31] Medicine 2.0,[32] Telco 2.0, Travel 2.0, Government 2.0,[33] and even Porn 2.0.[34] Many of these 2.0s refer to Web 2.0 technologies as the source of the new version in their respective disciplines and areas. For example, in the Talis white paper "Library 2.0: The Challenge of Disruptive Innovation", Paul Miller argues

Blogs, s and RSS are often held up as exemplary manifestations of Web 2.0. A reader of a blog or a is provided with tools to add a comment or even, in the case of the , to edit the content. This is what we call the Read/Write web. Talis believes that Library 2.0