When should we prefer to use JSF

we work on web based applications in servlets and jsp .
this is my first message in this forums...
since nowadays i come across hearing JSF..i am interested to clarfiy that weather it is used along with jsp
or it would replace jsp....
say
index.jsp----->index.jsf

In the project I am working on we have adopted the convention of using the .jsf extension for JSPs that contain JSF tags (mainly forms) and .jsp for regular JSPs. This helps to differentiate the pages that are displayed via the Faces servlet and the distinction can be useful when writing build scripts or using other automated tools.
-- Keith

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