What are Web 2.0 Features?

1. Cascading style sheet to allow users to control website content presentation and separation
2. XHTML & HTML markups validated semantically
3. Syndication, aggregation & notification of data in RSS feeds
4. Web log publishing tools, wikis or forums, instant messengers etc
5. Websites with Collaborative tagging, social classification, social indexing and social tagging can be developed
6. XML, JavaScript based APIs can be used for website development
7. Completely dynamic and interactive website development using Open source technologies and rich internet applications