UX and UI Designers are recent specialisations of web design's profession. UX Designers are concerned with user experience and work so that the user experience is both qualitative and perceptible. UI Designers build the interface (the communication zone between man and machine), ensure its graphic consistence, a flawless navigation, and qualitative content. UX and UI Designers are creative people with strong imaginative and creative abilities, knowledge in psychology and sociology, and technical programming skills.