Because color impressions are both quick and long lasting, decisions about color are a critical factors in success of any visual experience. Color can sway thinking, change actions, and cause reactions. Traffic lights send this universal message. Likewise, the colors used for a product, web site, business card, or logo cause powerful reactions.
Color sends a subliminal message, one which plays a critical role in success or failure.
Color combinations can attract or distract. The human brain requires a sense of order or it will reject whatever it sees. If too many colors are used, the viewer will become visually confused and will reject the image. If not enough color is used, boredom results. The right color combinations can be as important as the individual colors.