What is Web 2.0? Simply put Web 2.0 is a set of principles and practices that sites demonstrate. The web is the platform and the user controls their own data, web sites (applications) are interactive rather than the flat click the link type web page format that is common for many web sites.
Interaction within sites and also contribution, editing, publishing, etc are some of the features of web 2.0 applications. Also most are free to users, receiving money from online advertising is how most organizations host the applications without charging the user.
There are many examples of web 2.0 applications that are currently extremely popular on the web, some of these are:
~ Blogs- Online journals and articles written by the general user population, allowing interactive discussions through commenting on one an others blogs, blogs also have a feature called RSS feeds (which is the ability to subscribe to blogs of interest and have continuous automatic updates sent to you when the blog is added to). Blogs are archived regularly and new posts are added to the top of the page to allow ease of navigation and usability.
~Google- Google search, google maps, google earth, google images- Google applications have become so popular that the term I'll just google it has become a part of our vocabulary.
~Wikipedia- this is an online encyclopedia, the content of which is published and edited by users for users.
~ also eBay (online selling/buying, auction or instant).
~ Amazon (online shopping) and others.
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