Final answer:
The business practice of enticing viewers to share advertisements with their networks is known as viral marketing. It differs from crowdsourcing, which involves contributions from many people online.
Step-by-step explanation:
A business that creates advertisements in a way that entices viewers to share the message with their friends through email or social networks is engaging in viral marketing. This form of marketing leverages the power of social networks and word-of-mouth to spread information, much like a virus, quickly and widely. Viral marketing is different from crowdsourcing, which is the process of obtaining services, ideas, or content by soliciting contributions from a large group of people, particularly from an online community. It is also distinct from modernization, which refers to the transformation of societies from a pre-industrial state to an industrial one.