This document discusses rumors and their propagation. It defines rumors as unverified information that is spread from person to person, sometimes changing slightly with each retelling. The document outlines two models that describe how rumors spread through a population - the DK model involving ignorant, spreader, and stifler individuals, and the MK model involving direct contact between spreaders and others. The document also distinguishes rumors, gossip, slander, and urban legends, and discusses why rumors are spread and how to prevent their propagation.