According to Dictionary.com, a sociopath is someone whose personality is psychopathic and who lacks a social conscience or notions of moral responsibility. Sociopaths are prone to antisocial and criminal behavior. The psychologist G.E. Partridge coined the term around 1930, taking "socio-" and modeling the term on "psychopath."
Psych Central notes that while "sociopath" and "psychopath" are used interchangeably and defined as such in dictionaries, professional use distinguishes between the two. Psychopaths are deemed a potentially distinct taxonomical class within populations, a product of natural selection. Sociopaths, on the other hand, are the results of undesirable environmental influences that lead to behavioral and physiological similarities to psychopaths. However, antisocial personality disorder is a label that is equally applicable to sociopaths and psychopaths.