Web applications have entered a new era driven by web site goals such as fast response to user actions and user collaboration in creating and sharing web site content. The popular term attributed to these highly responsive and often collaborative sites is Web 2.0. Some prime examples of Web 2.0 are web sites such as Google Maps and Flickr. Google Maps offers a highly responsive user interface (UI). For instance, you can view a map, then move your cursor across it to see adjacent areas almost immediately. Flickr is a site on which users store and share photographs — users manage almost all the site’s content.
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