Existential concepts explore fundamental questions about existence, meaning, and individual freedom. They often address the nature of being, the purpose of life, and the inevitability of death. Philosophers like Jean-Paul Sartre and Simone de Beauvoir emphasize personal responsibility and the idea that individuals create their own essence through choices. These concepts also delve into feelings of absurdity and alienation, as seen in the works of Albert Camus. Existentialism encourages self-exploration and authenticity, urging individuals to confront their own beliefs and values in a world that may seem indifferent or chaotic.