This document provides an introduction to viral marketing strategies for marketers. It defines viral marketing as content that creates a urge in viewers to share it with others, allowing it to spread widely. Some key factors that can increase the chances of content going viral include making it highly shareable, giving it a personal touch that audiences care about, and ensuring it spreads organically rather than through replication of past viral campaigns. The document provides references for marketers to learn more about designing effective viral marketing campaigns.