Marketing focuses on understanding customer needs and developing products to meet those needs. It views the business as satisfying customers and takes an outside-in perspective. Marketing includes various activities before and after sale to ensure customer satisfaction. Selling focuses on moving existing products to customers and views the business as producing goods. It takes an inside-out perspective and emphasizes exchanging products for money without ensuring long-term customer value or satisfaction. Selling is a narrower concept that occurs after production. The key differences are that marketing starts with the customer while selling starts with the product, marketing aims to satisfy customers as the purpose of business while selling aims to make sales and profit, and marketing involves various pre- and post-sale activities