Advertising refers to the information about the product. Service or idea Without the individual and taxable costs. The hope is to predispose the resulting sales. And can identify the owner of such advertisements.
The ad refers to the patterns, news about the item. A service or an idea without people and must charge in order to motivate by the non-profit sales and be able to identify who owns a piece of advertisement.
The ad refers to the news about products, services or ideas without having to pay expensive fees to motivate people, and in the hope the sales and advertising pieces can be identified by their respective owners.