Color therapy is a clinical approach to psychology that involves exposing people to particular colors for therapeutic purposes. Most mainstream psychologists believe this is quackery. Don't waste your money.
It is a holistic treatment. Since color can affect mood, colors and sometimes colored lights are used to change the mood and induce certain feelings in the patient.
It started in the early 20th century. People said certain colors (blue, green) would help you relax. Red supposedly increased your immune system. It's not recognized by serious counselors.
Color therapy (or "chromotherapy") is alternative medicine technique which uses color to restore emotional, physical, and/or spiritual balance within a person. Color therapy is rich in both history and criticism.
Each color evokes a particular feeling and attitude. Color therapy is the use of colors to create a sense of satisfaction or be able to introspect for a better life.