Portlets
Portlets are reusable Web components which display relevant information to portal users. Examples for portlets are: Portlet standards enable developers to create portlets that can be plugged in any portal supporting the standards.The purpose of the Web Services for Remote Portlets (WSRP) specification 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 JSR-168 portlet specification enables interoperability between portlets and portals. This specification defines a set of APIs for portal computing addressing the areas of aggregation, personalization, presentation and security.
