WebSphere Portal takes the advantage of the WebSphere Application Server, making use of its J2EE services. WebSphere Portal itself installs as an Enterprise application in WebSphere Application Server.
The following are some definitions and descriptions of Portal concepts.
A portlet is an application that displays page content.
Portlet applications are collections of related portlets and resources that are packaged together. All portlets packaged together share the same context which contains all resources such as images, properties files and classes.
A portal page displays content. A page can contain one or more portlets. For example, a World Market page might ...