Traffic getting from organic result,but not from PPC ad.Why?

[uthra]

I have the top place for my website on Search Engine Result Page and also Search Engine Marketing Page(PPC ad) on Google.But i have analyzed through Google Analytics that i am getting more traffic and business through my website from the organic search result instead of PPC advertisement.Why i am not get the that much traffic and leads from PPC ad similarly from Organic Search Result?