Existentialism is a philosophical movement that emphasizes individual existence, freedom, and choice. According to existentialists, reality is subjective and only exists in relation to the individual's experiences and beliefs. Existentialists believe that the world has no inherent meaning or purpose, and that individuals must create their own meaning through their actions and choices. They argue that our existence precedes our essence, meaning that we are responsible for defining ourselves through our actions. Key existentialist thinkers include Jean-Paul Sartre, Simone de Beauvoir, and Friedrich Nietzsche. Sartre famously stated that existence precedes essence, emphasizing the idea that individuals are free to choose their own paths and define their own identities. Existentialism challenges traditional notions of objective reality and encourages individuals to embrace their autonomy and take responsibility for their actions. By acknowledging the subjective nature of reality, existentialism invites us to question the meaning of our lives and consider the impact of our choices on our own existence.