Simply put, criminology is the study of crime. Criminologists therefore conduct researches in order uncover information that will help them understand the reason behind the crimes and ways through which such crimes can be averted in the future. On the other hand, criminal justice deals with the formation and enforcement of law, as well as the systematic process of punishing criminals. Therefore, in simpler terms, criminal justice studies in depth the various stages of the justice system including its legislation, enforcement, punishment process, response to victims and how this entire process affects crime.
Being the study of crime, criminology has a direct relationship with the study of deviance. The study of deviance focusses on behavior which despite being legal or illegal, go against the socially accepted code of conduct. In most cases the behavior found to be deviant but legal are usually indicators or predecessors of illegal behavior, for example alcoholism and some forms of mental disorders, hence the overlapping with criminology. In addition to this, the fact that criminal behavior is deviant behavior qualifies criminology as a branch in the study of deviance behavior, further explaining their overlapping nature.
The consensus view of crime holds that the society is governed by the same principles and members of the society are supposed to uphold these principles that govern them. Therefore, criminal actions are illegal since they disregard these principles and ultimately affect negatively the society. The conflict view, on the other hand, maintains that interpersonal conflict is what is responsible for shaping human behavior. In addition to this, the view states that persons in power in the society are likely to use this power for their own selfish interests. Lastly, the interactionist view dictates that a person is predisposed to interpret an action or event based on their view of how other people respond to the same action or event.