Sociology is a vast field of study. It is a social science which primarily studies the behavior of society in a holistic manner. Some of the popular sociological theories include functionalism, utilitarianism, structuralism, symbolic interactionism, etc. This field helps in making reforms by informing planners, social workers, non-governmental organizations, policy makers, etc. about the current sociological situation and providing solutions to them. Such selected concepts that redefine this subject have been presented in this book. It is a vital tool for all researching and studying sociology.