This document provides a review and analysis of different marketing definitions from 1925 to the 1970s. It examines key marketing concepts like needs, products/services, value, exchange, and markets. The document categorizes marketing definitions as social vs managerial and traces the evolution of definitions from a production focus to a customer focus. It analyzes definitions from scholars like Clark, Levitt, AMA, Rodger, and Bartles based on concepts like the 4Ps, segmentation/targeting/positioning (STP), and satisfying customer needs. The document aims to provide insights on how marketing definitions have developed over time.