One of the most challenging concept in marketing deals with understanding why consumers behave in a certain way or do what they do (or don’t do). Two major psychological concepts are often used to explain and understand the consumer’s behaviour. The first is the so called in psychology the cognitive psychology in which the focus of the study is the mental behaviour i.e. the internal influence such as perception, memory, attention, attitude, beliefs, values, personality and buying motives. The second psychological concept is the social psychology in which the phenomenon of consumer behaviour is completely influenced by the external forces, i.e. social and referenced groups. There is no doubt that the consumer behaviour is extremely complex due to the nature of human beings differences in all the levels. Nevertheless, a common definition of consumer behaviour is the study of individuals, groups, or organizations and the processes of the buying units and the exchange processes involved in acquiring, consuming, and disposing of goods, services, experiences, and ideas. But such knowledge is critical for marketers since having a strong understanding of buyer behaviour will help shed light on what is important to the customer and also suggest the important influences on customer decision-making. Using this information, marketers can create marketing programs that they believe will be of interest to customers.…