Google: [sap crm overview presentation|http://letmegooglethatforyou.com/?q=sap crm overview presentation]
Rahul, though Greg was very moderate, I will put it bluntly. If you need a documentation mailed to you, then this is not the place to ask for. Read the Forum [Rules of Engagement|https://www.sdn.sap.com/irj/scn/wiki?path=/display/home/rulesofEngagement] and act like a professional.
But here is the link for the [CRM documents in SDN|Re: error in b2b shop url.] put by Greg. I am not sure if Google returned this link.