Difference between portal component and portal service?

Hi I am kishore...
         I worked on portal components but not on portal services... Would anybody tell the difference between the portal components and portal services...? What is a portal service..?
           How we know which one to choose in the scenario.?
    Thanks in adavance

Hi kishore,
A portal component is custom Java code that is executed according to user requests, and generates HTML output for display on the client.
Portal components:
Page builder, which assembles pages
Admin tools, such as logger, which is comprised of user interface messages.
Pages
Technically, the page is also an iView. A page includes iViews or pages (nested) and Layout components
iViews
There are two different isolation levels (iView types)
Embedded: iViews html is embedded as part of page html. iViews are called synchronically on the server, and retrieved in one response, to the client (this is the page response).. Each iView reloading reloads all iViews on page.
URL (Isolated): iViews are fetched by an IFRAME element in an own request. One response for the page followed by additional request-response for each iView (depending on browser 2-4 requests simultaneously).
Portal Services:
A portal service is a component that offers a globally accessible function in the portal.
A portal service act as the middleware, that is, interfaces that are enabled to exchange procedures and data. They offer functionality to portal components, and other services.
There are two groups of portal services:
Portal services (part of the PRT)
Caching
Notification
iView service
Application Repository
System Landscape
Role, pages, worksets
Web Services
Unification service
Portal services (external to the PRT)
Client Eventing
URL generator
Logger
JCO client service
Hope this helps.
Regards
Atul Shrivastava

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2) Also SLD entry is required.
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