Existentialism is not a school of thought so much as a trend that appears throughout philosophy during the nineteenth and twentieth centuries. Prior to this time, philosophical thought had grown to become increasingly more complex and abstract. In dealing with ideas of nature and truth, philosophers began to exclude the importance of human beings.
However, starting with Søren Kierkegaard and Friedrich Nietzsche in the nineteenth century, several philosophers emerged placing a newfound focus on the human experience. Though there are significant differences between philosophers of existentialism (a term that would not be used until the twentieth century), the one common theme among all of them is the notion that philosophy should focus on the experience of human existence in this world. In other words, existentialism seeks out the meaning of life and finding oneself.
Though existentialist thought varies from philosopher to philosopher, there are several common themes. One of the key ideas of existentialism is that the meaning of life and discovering oneself can only be attained by free will, personal responsibility, and choice.
Paul Kleinman, Philosophy 101
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