This document discusses how marketing has changed and evolved in the 21st century due to factors like increased customer demands, faster product development, globalization, and new technologies. It defines marketing as "an organizational function and a set of processes for creating, communicating, and delivering value to customers." The key aspects of modern marketing discussed are understanding customer needs, developing products and services to meet those needs better than competitors, and maintaining customer relationships. The document contrasts previous concepts of marketing based around production and selling with the current customer-oriented "marketing concept."