Existentialism is a movement in philosophy and literature that emphasizes individual existence, freedom and choice. It began in the mid-to-late 19th Century, but reached its peak in mid-20th Century France.

During which period does Existentialism became popular?

Existentialism, any of various philosophies, most influential in continental Europe from about 1930 to the mid-20th century, that have in common an interpretation of human existence in the world that stresses its concreteness and its problematic character.

Who is the founder of existentialism theory?

European philosopher Søren Kierkegaard is thought to be one of the first philosophers of existential theory. Friedrich Nietzsche and Jean-Paul Sartre followed him and further developed the ideas.