In The Division of Labor in Society, Émile Durkheim examines one of the central questions of modern social life: how societies remain cohesive as they become more complex.

Writing at the end of the nineteenth century, Durkheim argued that traditional communities were held together by similarity—shared beliefs, customs, and ways of life—what he famously called mechanical solidarity. Modern societies, by contrast, depend on difference: an intricate web of specialised roles and interdependencies that produce what he termed organic solidarity.

Durkheims' book helped establish sociology as a discipline concerned not simply with individuals but with the invisible structures that bind them together. More than a century later, his account of labour, interdependence, and social cohesion remains foundational reading for anyone interested in how modern societies organise work, responsibility, and collective life.