Dasein is a technical term that helps free us from the artificial subject/object distinction and allows us to see self and the world belong together in a single entity of there-being.
Dasein is a being for which, in its being, that being is itself an issue. Dasein is essentially ahead of itself and has projected itself upon its ability to be before going on to any mere consideration of itself as care (i.e., as existing in the unity of the projection which has been fallingly thrown this entity has been disclosed as a 'there'.
Dasein is a nominalized infinitive, it has no plural form. It refers to any and every human being, in much the same way as das seiende : That which is.
Dasein is not being 'here' instead of over there, but is 'the possibility' of oriented being here and being over there.' The 'there' (da) is not a place but the space opened up and illuminated by being.
Dasein is everyday existence; it is a kind of skilled existence. It is not something occurrent which possesses its competence for something by way of an extra. Rather, it is primarily its ability to be. Dasein is in every case what it can be.
Dasein is a living being that always has before it a not-yet being. How can human dasein be given as a whole' For only in this way can one form a concept of life.
Dasein is everydayness. It exists as an entity in general already always coming to itself, that is to say, it is futural in its being in general.
Dasein exists, and it alone. That is because to 'existence' is to stand out and to perdure the openness of the there: Ek-sistence.