Existentialism emphasizes that individuals are solely responsible for giving their own lives meaning and purpose through the choices they make. A key idea is that existence precedes essence, meaning people exist first and then define their own essence or nature through their actions and decisions. Existentialists believe the universe is inherently meaningless and absurd, yet people still have freedom to choose how to act and the responsibility to accept consequences. Individuals experience anxiety in confronting this radical freedom and facing nothingness and death alone.