How did Jean-Paul Sartre contribute to existential thought?

Jean-Paul Sartre significantly contributed to existential thought primarily through his exploration of the nature of human existence. He is well-known for his philosophical ideas that emphasize individual freedom, responsibility, and the subjective experience of existence. Sartre posited that existence precedes essence, meaning that individuals are not defined by a predetermined nature or purpose but rather create their own identity and values through their choices and actions.

In his works, such as "Being and Nothingness" and "Existentialism is a Humanism," Sartre delves into concepts such as authenticity, despair, and the absurdity of life, highlighting the challenges and freedoms that come with human consciousness. His existentialism encourages a deep reflection on personal choices and the inherent anxiety that arises from recognizing the absence of a universal blueprint for life, thus making the individual's experience central to understanding existence. This focus on human existence and the individual's role in constructing meaning is what firmly places Sartre at the forefront of existential thought.