The life of all people without exception, its development will be permeated by a large number of situations and experiences that greatly affected his personality and his way of thinking. Before this fact presents a discipline dedicated to the study of how it affects the person the different experiences of life and such discipline is psychology which studies various mental processes from three dimensions, the cognitive, the affective and the behavioural and reflected in fields as the moral, social and spiritual. Psychology seeks to encompass the study of all human experiences, in such a way their field of action trafficking from the brain functions and forms as this is affected with different kinds of stimuli, to the mental development of individuals at different stages of his life. It should be note that psychology not Sun seeks to understand situations related to humans, since psychology is about fashion as they think animals, therefore can also be said that psychology studies both to humans as animals in their way of thinking, feeling and learning, in addition to this study as the process of adapting to the environment that surrounds the life of people and animals is. The method that has developed the current psychology to understand thought, is collecting information about different facts and experiences in which behavior is observed and thus organize them systematically and so to elaborate theories to contribute to the task of understanding how to act and having a means to explain the behavior and in some cases theories arrive at a point at which are useful to predict future actions and so to be able to intervene in them. Psychology in the development of its activity has been deployed through 2 ways that help you research, so are:-psychology as an experimental science, who are looking for a contrast of hypotheses, with various variables in experimental contexts, is normal psychology in this case go to other areas of scientific study to perform best examples. -Psychology looking to give a real development, from a perspective more broad, making valuations in its research methods, that seek to enrich the description and interpretation of various processes. It is true that scientific experimentation of Psychology develops both in humans and in animals, but is much more common application in humans, since the application of psychology is presented much more to treat people, and in a minor measure it is with animals, either as a subject of study or as an element to compare species. Psychology by having as object of study the man, is an application that moves between the biological and social, so in his work psychology works with a normal element of the environment, seeking to understand how this unfolds in the environment in which is usually located, i.e. in society.