Advertising has become a very specialized activity in modern times. In the business world  of today . supply is usually greater than demand . There is great competition between  different manufacturers of the same kind of product to buy their own particular brand . They always have to remind the consumer of the  name  and qualities of their  product. They do this by advertising. The manufactuere  advertises in the product in commercial radio programmes. He employs attractive sales- girls to distribute samples  of it. He  organizes competitions, with prize for the winners. He often advertises on the screens of local cinemas. Most  important of all , in countries that have television he has advertisements put  into programmes that will accept them.