Sociology is the scientific study of human society that focuses on society, human social behavior, patterns of social relationships, social interaction, and aspects of culture associated with everyday life. The term sociology was coined in the late 18th century to describe the scientific study of society. Regarded as a part of both the social sciences and humanities, sociology uses various methods of empirical investigation and critical analysis to develop a body of knowledge about social order and social change. Sociological subject matter ranges from micro-level analyses of individual interaction and agency to macro-level analyses of social systems and social structure. Applied sociological research may be applied directly to social policy and welfare, whereas theoretical approaches may focus on the understanding of social processes and phenomenological method.

Traditional focuses of sociology include social stratification, social class, social mobility, religion, secularization, law, sexuality, gender, and deviance. Recent studies have added socio-technical aspects of the digital divide as a new focus. Digital sociology examines the impact of digital technologies on social behavior and institutions, encompassing professional, analytical, critical, and public dimensions. The internet has reshaped social networks and power relations, illustrating the growing importance of digital sociology. As all spheres of human activity are affected by the interplay between social structure and individual agency, sociology has gradually expanded its focus to other subjects and institutions, such as health and the institution of medicine; economy; military; punishment and systems of control; the Internet; sociology of education; social capital; and the role of social activity in the development of scientific knowledge.

The range of social scientific methods has also expanded, as social researchers draw upon a variety of qualitative and quantitative techniques. The linguistic and cultural turns of the mid-20th century, especially, have led to increasingly interpretative, hermeneutic, and philosophical approaches towards the analysis of society. Conversely, the turn of the 21st century has seen the rise of new analytically, mathematically, and computationally rigorous techniques, such as agent-based modelling and social network analysis.

Social research has influence throughout various industries and sectors of life, such as among politicians, policy makers, and legislators; educators; planners; administrators; developers; business magnates and managers; social workers; non-governmental organizations; and non-profit organizations, as well as individuals interested in resolving social issues in general.

Sociological reasoning predates the foundation of the discipline itself. Social analysis has origins in the common stock of universal, global knowledge and philosophy, having been carried out as far back as the time of old comic poetry which features social and political criticism, and ancient Greek philosophers Socrates, Plato, and Aristotle. For instance, the origin of the survey can be traced back to at least the Domesday Book in 1086, while ancient philosophers such as Confucius wrote about the importance of social roles.

Medieval Arabic writings encompass a rich tradition that unveils early insights into the field of sociology. Some sources consider Ibn Khaldun, a 14th-century Muslim scholar from Tunisia, to have been the father of sociology, although there is no reference to his work in the writings of European contributors to modern sociology. Khaldun's Muqaddimah was considered to be amongst the first works to advance social-scientific reasoning on social cohesion and social conflict.

The word sociology derives part of its name from the Latin word socius ('companion' or 'fellowship'). The suffix -logy ('the study of') comes from that of the Greek -λογία, derived from λόγος (lógos, 'word' or 'knowledge').^{[citation needed]}

The term sociology was first coined in 1780 by the French essayist Emmanuel-Joseph Sieyès in an unpublished manuscript. Sociology was later defined independently by French philosopher of science Auguste Comte (1798–1857) in 1838 as a new way of looking at society. Comte had earlier used the term social physics, but it had been subsequently appropriated by others, most notably the Belgian statistician Adolphe Quetelet. Comte endeavored to unify history, psychology, and economics through the scientific understanding of social life. Writing shortly after the malaise of the French Revolution, he proposed that social ills could be remedied through sociological positivism, an epistemological approach outlined in the Course in Positive Philosophy (1830–1842), later included in A General View of Positivism (1848). Comte believed a positivist stage would mark the final era in the progression of human understanding, after conjectural theological and metaphysical phases. In observing the circular dependence of theory and observation in science, and having classified the sciences, Comte may be regarded as the first philosopher of science in the modern sense of the term.