Web 2.0 refers to World Wide Web sites that emphasize user-generated content, usability, and interoperability. Key characteristics include rich user experiences, user participation through contributions of user-generated content, dynamic content, and use of metadata and web standards. Web 2.0 sites allow users to interact and collaborate through social media features and to act as creators rather than just passive viewers.

1. web 2.0
E4C 497410397
May Ho

2. Introduction
• Web 2.0 is a loosely defined intersection of
web application features on the World Wide Web.
• A Web 2.0 site allows users to interact and
collaborate with each other in a social media
dialogue as creators of user-generated content in
a virtual community, in contrast to websites
where users are limited to the passive viewing of
content that was created for them.

3. Characteristics
According to Best, the characteristics of Web 2.0 are:
• rich user experience
• user participation
• dynamic content
• metadata
• web standards
• scalability.

4. Concepts
Web 2.0 can be described in 3 parts, which are as follows:
•Rich Internet application (RIA) — defines the experience
brought from desktop to browser whether it is from a graphical
point of view or usability point of view.
•Web-oriented architecture (WOA) — is a key piece in Web 2.0,
which defines how Web 2.0 applications expose their
functionality so that other applications can leverage and
integrate the functionality providing a set of much richer
applications.
•Social Web — defines how Web 2.0 tends to interact much
more with the end user and make the end-user an integral part.

5. Concepts
Web 2.0 websites include the following features and techniques:
•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 wikis, users may extend, undo and redo each other's work. In
blogs, posts and the comments of individuals build up over time.

6. Concepts
•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“.
•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.

7. Usage
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:
•Podcasting
•Blogging
•Tagging
•Contributing to RSS
•Social bookmarking
•Social networking