Existentialism is a philosophy that emphasizes individual existence, freedom and choice. Key existentialist philosophers discussed in the document include Søren Kierkegaard, Jean-Paul Sartre, and Albert Camus. According to existentialism, humans possess free will and must take responsibility for their own actions without reliance on predetermined essence or purpose. The existentialist view influences philosophy of education by promoting self-directed learning, creativity, and value of helping students understand themselves as unique individuals responsible for their own choices and existence.