Final answer:
Existential quantification is a concept in existentialism that categorizes real things into being-for-itself and being-in-itself. Being-for-itself refers to conscious and free beings, while being-in-itself refers to non-conscious entities.
Step-by-step explanation:
Existential quantification is a concept in philosophy, specifically in the branch of existentialism. Existential quantification refers to the way existentialists categorize real things into two types: being-for-itself and being-in-itself. Being-for-itself refers to conscious and free beings, while being-in-itself refers to non-conscious entities. This concept emphasizes that humans possess consciousness and freedom, distinguishing them from non-conscious entities.