<human>:  In Heidegger’s Being and Time, how does he define the concept of Dasein?
<bot>: Dasein is a term that Heidegger uses to refer to the human subject. In Being and Time, Heidegger explains that Dasein is the being who is in the world and who exists in a state of thrownness, or being-toward-death. Heidegger uses this concept to explain the human condition, and to argue that humans are not simply a collection of biological processes, but rather are always already embedded in a web of meaning and understanding.