Existentialism is a philosophical movement that stresses individual existence.
Human beings are totally free and responsible for their own acts.
Another main idea of existentialism is the limitation of reason and the irreducibility of experience to any system. Stones, trees, and other objects do not share this existence, and man is open to the world and the objects in it. There is no set limit to how many choices man must make, and no particular set of rules or values one must follow. Rather, there is simply a framework in which action and choice are to be viewed, implying that there are rigth and wrong ways of choosing, although the individual is still completely free.