Virality is simply users sharing your product or service with others. There are three kinds of virality: Inherent virality is built into the product, and happens as a function of use. Artificial virality is forced, and often built into a reward system. Word-of-mouth virality is the conversations generated by satisfied users, independent of your product or service. All three matter, but should be treated as distinct forms of growth and analyzed in terms of the kind of traffic they bring in.
