Hi Faisal,
While searching for the
word "Rational Unified Process" at Google .com, I came across
this site.There are various resources on this page which will provide you information on RUP.
Also, you may purchase a book -
Rational Unified Process : An Introduction by Philippe Kruchten for more information on the same.
The google search also gives some other links which you may find helpful.
Hope this helps,
Sandeep