The link provided explains you the relation.
Ummm bharatemail at first I did not wanted to chime in but I guess I am tempted to- I do not if you have some how have developed the habit of being spoon feed
but it does seems so (sorry if that seems like a hardy
) but please do yourselves a favor- the question you asked was pretty basic by any standard and on top of that you did not bother to open the link provided.
All in the good intention only
My GMAT Journey 540->680->730!
~ When the going gets tough, the Tough gets going!