This document provides an overview of word-of-mouth marketing (WOMM). It defines WOMM as positive or negative communication between consumers about products, services, and ideas. WOMM is seen as an effective and inexpensive form of marketing. The document outlines different types of WOMM strategies and campaigns, how WOMM works by using influencers to spread messages, and key factors like talkers, topics, tools, tracking, and taking part that contribute to successful WOMM. It also notes that negative WOMM may have a greater impact than positive WOMM and provides an example case study of the Obama presidential campaign's effective use of WOMM.