The document discusses the Elaboration Likelihood Model (ELM), which is a model of persuasion. The ELM explains that there are two routes through which persuasive messages are processed: the central route and the peripheral route. The central route involves a high level of receiver involvement and motivation to analyze the message carefully. The peripheral route involves low receiver involvement and uses things like catchy tunes, colors, and celebrity endorsements to grab attention without careful message analysis. The ELM helps determine what types of messages and techniques will work best for different audiences depending on their level of involvement in the topic.