a marketing strategy that focuses on spreading information and opinions about a product or service from person to person, especially by using unconventional means such as the Internet or email: Which online social networks can help with viral marketing?
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a direct marketing technique in which a company persuades internet users to forward its publicity material in e-mails (usually by including jokes, games, video clips, etc)
a marketing strategy in which conventional media are eschewed in favour of various techniques designed to generate word-of-mouth publicity, in the hope of creating a fad or craze
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012