A portlet is information that is placed within a region on a page. The content of a portlet is determined by it's purpose and by the data it is designed to display. This snapshot of a Central Services Staff page, for example, shows four portlets. One allows a search from categories selected on a drop-down list. Another has been customized to show the weather in Los Altos. Another is a list of favorite links that can be customized, and the last one is a RSS news feed from the New York Times with links that update each time you open the page.
You can add portlets and arrange them as you like on regions of a page where user modification is allowed. To see the complete list of objects you can place in a region, click the add portlet icon  while editing a page.
All portlets come from a data source registered with OracleAS Portal, called a portlet provider, and the OracleAS Portal itself is a portlet provider, because certain aspects of the product have been made available so that we can use them to build the pages. The Portal communicates in the background and connects to data sources defined by the portlet creators.
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