This article describe about Human Factors and Ergonomics, which is the study of how humans behave physically and psychologically in relation to particular environments, make technological systems safe, effective, and easy and enjoyable to use. It is concerned with the “fit” between the user, equipment and their environments. It’s usability is now sometimes used as an alternative to human factors, although human factors is really a larger area of study, including responses that are unrelated to usability, such as reactions and preferences in relation to visual and other sensory stimuli.