Advertising in all its forms is present to consumers on TV, radio, in newspapers, and magazines. Each consumer is confronted with it approximately 2,500 to 5,000 times a day, whether consciously or unconsciously. These figures already suggest that traditional mass advertising has a significant problem with its efficiency. Consumers have a negative attitude towards advertising, which has led them to develop a defensive stance. Furthermore, it is not possible to absorb this mass of advertising. Experts suspect that 75% of campaigns do not have a balanced cost-benefit ratio. Quantitatively, 22 of the 29 billion euros invested in advertising annually in Germany "drain away." This book deals with viral marketing and also presents other alternative forms of marketing on the internet. Part A focuses on online marketing. Introduction.