hosted services — such as social-networking sites, wikis and folksonomies — which aim to facilitate collaboration and sharing between users.The concept of “Web 2.0″ began with a conference brainstorming session between O’Reilly and MediaLive International.Earlier users of the phrase “Web 2.0″ employed it as a synonym for “Semantic Web”. The combination of social-networking systems such as FOAF and XFN with the development of tag-based folksonomies, delivered through blogs and wikis, sets up a basis for a semantic web environment.
Characteristics of Web 2.0
1)”Network as platform” — delivering applications entirely through a browser.
2)Users owning the data on a site and exercising control over that data.
3)An architecture of participation that encourages users to add value to the
application as they use it
4)A rich, interactive, user-friendly interface based on Ajax or similar
frameworks.
5)Some social-networking aspects.
Web2.0 Features
1)Rich Internet application techniques, often Ajax-based
2)Semantically valid XHTML and HTML markup
3)Microformats enriching pages with additional semantics
4)Folksonomies (in the form of tags or tagclouds, for example)
5)Cascading Style Sheets to separate presentation from content
6)REST and/or XML- and/or JSON-based APIs
7)Syndication, aggregation and notification of data in RSS or Atom feeds
8)Mashups, merging content from different sources, client- and server-side
9)Weblog publishing tools
10)Wiki or forum software, etc., to support user generated content
11)OpenID for transferrable user identity
12)Use of Open source software, such as the LAMP stack
Differences between Web1.0 and web 2.0
Web 1.0 Web 2.0
DoubleClick –> Google AdSense
Ofoto –> Flickr
Akamai –> BitTorrent
mp3.com –> Napster
Britannica Online –> Wikipedia
personal websites –> blogging
evite –> upcoming.org and EVDB
domain name speculation –> search engine optimization
page views –> cost per click
screen scraping –> web services
publishing –> participation
content management systems –> wikis
directories (taxonomy) –> tagging (”folksonomy”)
stickiness –> syndication
web 1.0
web 2.0