"Being in and for itself" is a philosophical concept, primarily from Jean-Paul Sartre, that contrasts two modes of existence: being-in-itself is the being of non-conscious things (like a rock) which are solid and self-contained, while being-for-itself is the being of consciousness, which is defined by self-awareness, freedom, and an awareness of its own lack of a fixed essence.
Humans are a unique combination of both, existing as a physical object (in-itself) and as a self-conscious being (for-itself), which creates the ambiguity and freedom of human existence.
Being-in-itself
Definition: The being of inanimate objects and things that simply "are". It is a solid, self-identical, and passive mode of existence.
Characteristics: Lacks consciousness, self-awareness, and freedom. It is fully determined by its nature or "facticity"
Example: A rock, a tree, or a table have being-in-itself.
Being-for-itself
Definition: The being of consciousness, which is a dynamic and spontaneous mode of existence. It is defined by its ability to be aware of itself and to negate, or "nothinize," the fixed being of things.
Characteristics: Is fluid, not self-identical, and exists through its actions and choices. It is the source of human freedom and responsibility.
Example: A conscious human being is being-for-itself because they are aware of themselves and can choose to act or change.
The human condition
A blend of both: Humans are unique because they are both a being-in-itself (a physical body) and a being-for-itself (a self-conscious mind).
Ambiguity and contradiction: This combination leads to a fundamental ambiguity in human existence, as we are both fixed by our physical nature and free to transcend it through our consciousness.
Anguish and bad faith: The awareness of this total freedom, combined with the responsibility it entails, can lead to anguish. This can also result in "bad faith," where we deceive ourselves to avoid facing our freedom and responsibility.