Sigmund Freud was a psychologist, theorist, and one of the most influential thinkers of the 20th century. He proposed many experiments and ideas about development of the human mentally and physically. Freud uses some words in his dialogue that need to be understood to grasp what he is truly trying to convey. The first word is repression, the mind’s effort to keep thoughts and impulses out of the forefront of thought by pushing them into the subconscious. Freud believes that this happens without us being aware of it, why certain thoughts and memories are hidden because they could be hurtful to us mentally. This process is sometimes helpful and sometimes harmful. The next term is sublimation, another defense mechanism that is more adaptive. It is like an outlet for the emotion/impulse that keeps problems from occurring. For example, an aggressive person will pick up sports to let out their frustration in a healthy manner. Neurosis is another term that Freud uses. He defines it to mean manifestations of anxiety that are expressed subconsciously. There can be some outward physical symptoms as well. Now, we just classify neurosis into specific disorders, such as anxiety, OCD, depression, personality disorders, etc. Psychosis is the last of the terms, a severe psychological disorder where the ego is carried away by the id and the person is detached from reality. Disorders like this are known usually in terms of schizophrenia and other extreme cases. These terms are ones that Freud uses and discovered in his research, and it is helpful to know the background when reading his findings.