Portlet

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Portlets are reusable Web components that display relevant information to portal users. In general a portlet appears to the end user as a rectangular section of a web page offering a limited set of information or functionality. Applications for portlets include the display of Email, weather reports, discussion forums, and news.

Portlet standards are intended to enable software developers to create portlets that can be plugged in any portal supporting the standards.

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WSRP standard

The purpose of the Web Services for Remote Portlets interface is to provide a web services standard that allows for the "plug-n-play" of portals, other intermediary web applications that aggregate content, and applications from disparate sources.

The portlet specification enables interoperability between portlets and web portals. This specification defines a set of APIs for portal computing addressing the areas of aggregation, personalization, presentation and security.

Other than the reference implementation, a number of vendors provide implementations of the portal container (for a fee). Two of the leading vendors are IBM and BEA Systems. These vendors provide standards based implementations but also provide extensions not yet approved by the standards body.

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