This document discusses key concepts of existentialism philosophy including its focus on individual existence, personal freedom, and authentic choice. It outlines existentialism's views on ontology, epistemology, and axiology. It also profiles three influential existentialist philosophers - Soren Kierkegaard, Friedrich Nietzsche, and Jean-Paul Sartre - and summarizes some of their major ideas. Finally, it provides implications of existentialism for education, emphasizing the importance of encouraging students to pursue authentic lives through independent choices and responsibility.