This document provides an overview of existentialism and its historical background. It discusses key existentialist thinkers like Pascal, Nietzsche, Dostoevsky, and Kierkegaard. Some of the main ideas discussed include the inevitability of nihilism according to Nietzsche, the insufficiency of reason highlighted by Dostoevsky, and Kierkegaard's view of the necessity of difficulty and that crowds represent untruth rather than the individual. The document gives context around the origins and development of existentialist thought.