This document defines marketing and explains its key concepts and functions. It discusses the importance of marketing for modern business and outlines the scope of marketing activities. The document also explains the selling concept, marketing concept and societal concept of marketing. It distinguishes between marketing and selling, and marketing research and marketing information systems. The three key points are: 1) Marketing is defined as a system of business activities designed to plan, price, promote, and distribute products to target markets to achieve organizational objectives. 2) The scope of marketing includes activities like marketing research, product development, pricing, advertising, sales promotion, packaging, branding, and after-sales service. 3) The importance of marketing is that it helps