i had tried to find this font in many web pages but couldn't find the exact font.So please can somebody help me to find this font.
This font called Cuprum. It is available for free from Google fonts
In the future, give this tool a shot (http://www.myfonts.com/WhatTheFont/) it's been helpful time and time again for font matching. I would say it's more-or-less 90% accurate.