Hi
basically it's used to change an input variable so that the result of the
formula equals what you want it to ...
say i have the following
A B C
1 10 20 =A1+B1
now C1 will give me 30, but if i want to know what B1 will need to be if i
want C1 to show 50, i can use goal seek
Set C1 to value of 50 by changing B1
Hope this helps
Cheers
JulieD