This document provides an introduction to classic sociological theories, focusing on the works and concepts of Émile Durkheim. It discusses Durkheim's major works including Division of Labor in Society, The Rules of the Sociological Method, Suicide, and The Elementary Forms of Religious Life. Some of his important concepts discussed are social solidarity, collective conscience, division of labor, and anomie. It also briefly summarizes Durkheim's views on how the degree of social integration and collective conscience affects suicide rates.