Viral marketing is a marketing phenomenon that facilitates and encourages people to pass on your marketing message voluntarily. Typically, viral marketing can take the form of quirky/witty video clips, images, interactive flash and even SMS messages.

Away from its Internet usage, viral marketing has been referred to as "word-of-mouth," "creating a buzz," "leveraging the media" and "network marketing." But online, for better or worse, the term is viral marketing.