Which of the following best defines a defense mechanism?

A defense mechanism is best defined as a way to manage anxiety. This concept originates from psychology, particularly in the context of psychoanalytic theory. Defense mechanisms are unconscious psychological strategies that individuals employ to protect themselves from anxiety and to cope with reality and emotional stressors. They help to reduce anxiety by distorting or denying reality, allowing individuals to maintain their self-image and psychological integrity in the face of stressful situations.

For instance, someone might use repression to push uncomfortable thoughts out of their conscious awareness, or rationalization to justify behaviors that would otherwise provoke anxiety. By managing anxiety through these mechanisms, individuals can navigate challenging emotions and situations more effectively.