What does das Man mean in Heidegger’s account of everyday life?

In Martin Heidegger’s Being and Time, das Man—often translated as "the They"—is a fundamental concept used to characterize the anonymous, conformist nature of everyday life.12

Heidegger uses das Man to describe a mode of inauthentic existence where individuals lose their sense of self by conforming to the expectations, norms, and distractions of the "mass society". In this state, Dasein (the human individual) avoids facing its own finitude and the inevitability of death by seeking refuge in social modalities such as "idle talk," "curiosity," and "ambiguity".123

Rather than making autonomous choices, an individual in the mode of das Man allows their possibilities for existence to be determined by others. This existential passivity reflects a failure to actualize one's own potential for being a self. Conversely, Heidegger suggests that through the "call of conscience," Dasein can be summoned away from this immersion in the anonymous "They" toward a state of authenticity, where the individual takes responsibility for their own existence and confronts their unique possibilities.4123