Andrea receives an e-mail from her sister-in-law that is actually a recommendation for a website with a demonstration of a new home hair-coloring system. She later discovers that her sister-in-law received a free trial kit for passing Andrea's and four other friends' e-mail addresses along to the marketer. This is known as

Question

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This is an example of viral marketing, where a message or offer spreads rapidly through social networks or online platforms. In this case, the marketer used Andrea's sister-in-law as a "vector" to reach more potential customers by giving her a free trial kit in exchange for referring others.

Andrea Receives an E-Mail from Her Sister-In-Law That Is Actually