This document discusses various defense mechanisms described by Freud. It defines fear as a response to real danger while anxiety is a subjective feeling of discomfort caused by threats to self-esteem. Defense mechanisms are unconscious ways of dealing with anxiety, such as repression of unpleasant memories, rationalization by making excuses, and intellectualization of addressing problems logically rather than emotionally. Both successful mechanisms like sublimation and unsuccessful ones like denial are explained with examples.