The informal communication between consumers about products, services, or brands, typically through personal conversations, recommendations, or reviews. It's considered one of the most trusted and influential forms of marketing because it comes from peers rather than companies.
The phrase dates back to the 1500s, literally referring to spoken communication passed from person to person. In marketing contexts, it gained academic recognition in the 1960s-70s as researchers studied how consumer opinions spread through social networks. The digital age has amplified WOM through online reviews, social media, and digital platforms.
Word of mouth is so powerful that Nielsen research shows 92% of consumers trust recommendations from friends and family over all forms of advertising - yet it's also the most difficult marketing channel to control or predict. Interestingly, negative word of mouth spreads faster and wider than positive, with dissatisfied customers telling an average of 9-15 people about their experience, while satisfied customers tell only 4-6.
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