The document is an excerpt from an introductory sociology textbook. It introduces sociology as the systematic study of human social behavior and relationships. It discusses the key founders of sociology like Comte, Durkheim, Marx and Weber. It also outlines the major theoretical perspectives in sociology - functionalism, conflict theory, feminist theory and symbolic interactionism. The excerpt emphasizes that sociology aims to study social issues scientifically and avoid relying solely on common sense. It highlights how sociology can reveal unintended consequences and debunk misconceptions about social problems.