Buzz marketing is a low-cost marketing technique that relies on word-of-mouth recommendations to generate interest in a product or service. It works by identifying influential customers to try a product and encourage them to talk about their experience with others in their social networks. Buzz marketing can be an effective way to reach many potential customers faster than traditional advertising. However, companies have little control over buzz marketing and there is a risk of negative word-of-mouth spreading. The document provides examples of successful buzz marketing campaigns and discusses challenges in sustaining buzz over the long term.