Sociology and Psychology are interrelated. Psychology is the study of human behavior and thus psychology depends on sociology for understanding the human nature. Sociological researches have contributed a lot to psychology.
Similarly, the sociologists also take help of psychology. They take the psychological factors into consideration while studying changes in social structure. Social psychology, is a branch of psychology serves as a bridge between psychology and sociology. It studies mental processes of man as a social being. There exists a mutual relationship between sociology and social psychology.
1) Sociology studies society as a whole, social psychology studies individual behavior of man as a social being.
2) Sociology deals with social processes whereas social psychology deals with mental process.
3) Sociology studies social forms and social structure where as social psychology concerned with the individual and his behavior.