Difference between New Formula and Formula Variable

Can any body explain what is the difference between New Formula and Formula Variable.
Thanks

Hi,
Formula:http://help.sap.com/saphelp_nw04/helpdata/en/d3/8057f830a911d4b2be0050dadfb23f/frameset.htm
Formula Variable:If you want use variables in the formulas of a form, you need to use formula variables. You can use formula variables only in form reports, and must define them in the form itself. They can be replaced in the same ways as text variables when you execute the report.
http://help.sap.com/saphelp_nw04/helpdata/en/5c/8db0b1555411d189660000e829fbbd/frameset.htm
Bye
Dinesh

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