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Every successful web site does something unique or does something in a way that is better than anyone else has done it before. Although Liferay has tons of functionality out of the box, much of that functionality is a default implementation of features that are under the hood. What do I mean by that? Let me answer by giving you some examples.
Liferay Portal has a collaboration API that contains features allowing users to post discussions, rate items, or tag content. This API has been used to provide everything from the Message Boards portlet, to tagging wiki articles, to rating shopping cart items. This book will introduce you to these APIs so you can consider what kinds of applications you can build with these powerful features.