Existentialist philosophy is a school of thought that emphasizes individual existence, freedom, and choice. It is a complex and profound field that has given rise to many great thinkers, some of whom are synonymous with the term "existentialist philosopher." Other terms that might be used to describe these great thinkers include "existential thinker," "existentialist theorist," "existentialist thinker," and "existential philosopher." Some of the most well-known names in existentialist philosophy include Jean-Paul Sartre, Martin Heidegger, Friedrich Nietzsche, and Albert Camus. Their work has contributed significantly to the development of modern-day philosophical thought, and has had a significant impact on other fields, such as literature, psychology, and sociology.