How does therapy in the treatment of depression?

How does therapy help in the treatment of depression?
Psychotherapy helps people with depression:

 Understand the behaviors, emotions, and ideas that contribute to his or her depression.
 Understand and identify the life problems or events -- like a major illness, a death in the family, a loss of a job or a divorce -- that contribute to their depression and help them understand which aspects of those problems they may be able to solve or improve.
 Restructure ways of thinking, negative attributes and attitudes someone has about himself, and ways in which faulty thinking may perpetuate depression
- Regain a sense of control and pleasure in life
- Learn coping techniques and problem-solving skills