In order to understand Evolutionary Psychology we need to begin with an explanation of Evolution and psychology. This progressive development resulted in humans sharing a common ancestry with ape-like creatures. Important for evolutionary theory is the idea of natural selection. Who we are today is largely a result of the success of our genes.
Psychology is the study of the mind and of human behaviour.
Behaviourism was partly rejected because it cannot avoid talking about people's beliefs and desires and because of the advent of the computer. This is because many believe the mind is similar to a computer in that it processes information. Against the background of these preliminary thoughts, Evolutionary Psychology is the theory that the complexity of the mind has developed as a result of natural selection in response to changing social conditions. However, a new modular view of the mind has developed in contrast to this view which sees it as being divided into numerous parts, all designed to deal with, and assess, a variety of information. Different environments pose different adaptive problems and so require different adaptations.