Although UI and UX are different concepts, they are interrelated and complement each other. While UX focuses on the functional features, technological competence, speed, content and customer experience of a website design, UI focuses on the external appearance of the website design, that is, the interface features. They are two essential elements of a professional website design. UI and UX cannot provide sufficient efficiency when used alone. By using these two concepts together in website design, very successful results can be achieved. It is understood how important UI and UX design is because it affects users' satisfaction with the website, their experience and the design features of the site.