The document provides an overview of existentialism and some of its key philosophers. It discusses how existentialism holds that (1) individuals are free and responsible for their own actions and identities, (2) existence is absurd as there is no inherent purpose or meaning to life, and (3) truth is subjective rather than objective. It profiles philosophers like Kierkegaard, Nietzsche, Sartre, Camus, and others who explored these existentialist themes and the anxiety of the human condition.