Consumer behaviour can be described as a person's decision-making process behind buying a product and the influences that lead to the purchase. Marketers must understand the buyer decision process which includes problem recognition, information search, alternative evaluation, purchase decision, and post-purchase evaluation. They also need to understand the target market, area of operation, consumer culture, and social factors. Consumer behaviour is influenced by celebrities/social media, culture, personal circle, and falls into three categories: routine, limited, or extensive involvement. Understanding all aspects of consumer behaviour benefits both firms and consumers.