Advertising what it its end message? (apart from profit)

 In looking at advertising...what (apart from money and profit) undergirds it?

...what is the teleology (end message) in the narrative they concoct, is their any epistemological (actual knowledge) in their advertising slogans, 

Defined narrowly, epistemology is the study of knowledge and justified belief. As the study of knowledge, epistemology is concerned with the following questions: What are the necessary and sufficient conditions of knowledge? What are its sources? What is its structure, and what are its limits?