The meaning of the word comes from the suffix "-logy" which means "study of," derived from Greek, and the stem "socio-" which is from the Latin word socius, meaning member, friend, or ally, thus referring to people in general. It is a social science involving the study of the social lives of people, groups, and societies, sometimes defined as the study of social interactions. It is a relatively new academic discipline which evolved in the early 19th century.
Because sociology is such a broad discipline, it can be difficult to define, even for professional sociologists. One useful way to describe the discipline is as a cluster of sub-fields that examine different dimensions of society. For example, social stratification studies inequality and class structure; demography studies changes in a population size or type; criminology examines criminal behavior and deviance; political sociology studies government and laws; and the sociology of race and sociology of gender examine society's racial and gender cleavages.
New sociological sub-fields continue to appear - such as economic sociology and network analysis - many of which are cross-disciplanary in nature.
Since the late 1970s, many sociologists have tried to make the discipline useful for non-academic purposes. The results of sociological