This document discusses consumer behavior and its importance. Consumer behavior is defined as the study of when, why, how, and where people buy products. It depends on consumer psychology and attempts to understand individual and group decision making processes. The main focus is customer satisfaction, as businesses exist only because of customers. Studying consumer behavior is important to develop better strategies, consider customer health, understand buying decisions, adapt to changing tastes, set prices, avoid failures, understand influencing factors, design satisfying products, decide product access, and determine effective promotion methods.