A definition of viral marketing
Viral marketing refers to marketing techniques that try to achieve a marketing objective through self-replicating viral processes, analogous to the spread of human/computer viruses.
Viral marketing can be compared to word of mouth and free public relations promotion. Families, friends and (business) relations are forwarding a marketing message to others because they are very much intrigued by the message (makes them laugh, cry or furious, for instance) or because they think the message is extremely relevant.
