Web 2.0: Concepts and Applications 11 The Web Becomes 2.0.

Web 2.0: Concepts

and Applications

11The Web Becomes 2.0

Overview

The World Wide Web has changed the way that people– Do business– Communicate– Share information

The Web has evolved from a collection of Web sites to supporting Web applications

Web 2.0 is characterized by interactive applications

Chapter 1: The Web Becomes 2.0 2

Overview


How the Web Has Changed

Early Web sites contained mostly text and small graphics

Graphics were minimized to decrease the time it takes to load a page using a slower Internet connection

Web sites were not always intuitive



Newer Web sites provide users with a rich browsing experience– Customizable layout– Bold graphics– Tabs– Additional services


Social and Technological Developments that Led to Web 2.0

Web 2.0 is the result of several evolutions:– Connectivity is available almost everywhere– The personal computer evolved into an appliance– Mobile phones are capable of accessing the World Wide

Web– Web browsers are easy-to-use– Web-based applications were developed for many devices– Web developers deploy new versions of software

applications– Society embraced technological changes



In the 1990s, many new companies called dot-coms used the Web to conduct business– Internet service providers– Amazon– Priceline

Many dot-coms went out of business by 2001The Web became a platform for social

networking, collaboration, and communication


The Web Browser

A Web browser is a software application for accessing and viewing Web pages– Mosiac

• Later marketed as Netscape• First graphical interface to the World Wide Web

– Internet Explorer• Became popular when distributed by Microsoft with Windows 95

– Firefox– Safari– Google Chrome


The Web Browser


The Web Browser

Modern Web browsers have streamlined their appearance

Tabbed browsing allows users to open new Web pages in a single browser window


The Web Browser


Features of Web 2.0 Applications

Online conversations– Blogs– Wikis– Sharing media– Collaboration

Digg is a Web site that allows its readers to submit interesting news stories that they find online and digg, or vote for, the news stories that others submitted



To participate in Web 2.0 applications, you likely will need a username and password– A username is a unique code name that identifies

you– A password is associated with your username

• You should achieve greater password strength

– During the authentication process, the application verifies your credentials


The Web as a Platform for Running Applications


A Database-Backed Web

Web 2.0 is often referred to as a read/write Web, or a database-backed Web– Web applications read from or write to a database

A Web server processes requests for Web pages sent over the Internet from a Web client– Client-server model


Software Accessible on Many Devices

You can browse Web content from almost anywhere on almost any electronic device that has a screen



In order for a Web application to run on different devices, it is important that they are designed in such a way that separates the process of accessing information from the process of displaying that information


Rich User Experience

Technologies such as AJAX, Adobe Flash, and Microsoft Silverlight allow Web browsers to display dynamic content without waiting for previous communication with the Web server to complete– Google Maps uses AJAX to allow the user to

reposition a map or zoom in and out by dragging• Only the map portion of the window will be updated



Predictive look-ahead, or AutoComplete, provides suggestions of valid responses based on letters that a user enters in a text box



AJAX relies on standard Web technologies to provide an engaging user experience

A browser plug-in is a software component that enables dynamic, animated display and functionality within a Web browser– Flash– Silverlight

Many rich Internet applications allow users to create, stream, or view video


Summary

Web 2.0 is the name given to the shift in how people have come to use the World Wide Web

Many Web 2.0 sites allow users to share knowledge, opinions, images, or videos

Web 2.0 promotes a culture of participation Users interact with Web 2.0 applications from a Web

browser and variety of Internet-connected devices Many Web applications use AJAX, Flash, and

Silverlight


Web 2.0: Concepts

and Applications

11The Web Becomes 2.0


Chapter 1 Complete

Web 2.0: Concepts and Applications 11 The Web Becomes 2.0.

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