Siva, Ben meant the "F" as in the last letter of .jspf, or fragment.
Normally, when you have a standalone JSP, you can type its name into a web browser and get some output. A JSP fragment is intended to be part of a JSP. So if you were to type its name into a web browser, you wouldn't expect to get anything meaninful, or even an error message.
If you have a JSP that only gets included in other JSPs, call it a JSPF. This is useful for common page elements, such as headers and footers.