UI design focuses mainly on the interaction between humans and machines. This includes both the usability of a website, but also the interface of an app or mobile application. UI designers focus exclusively on this named interface. Less relevant is the user’s experience and the flow between interfaces.  UX and UI designers work closely together to measure and improve user experience and usability. In the process, they constantly test new designs to correct errors.  UI designers have knowledge of front-end development and graphic design. Visual aspects in particular are important, while UX designers are more focused on user experience.  The focus in UI design is on visual touchpoints that allow the user to interact. They create combinations of fonts, color palettes, buttons, animations, and images. UX design encompasses the entire user experience from first contact to last. They create structural design solutions that the user has throughout the journey with the product.  UX design aims to delight with efficiency, while UI design aims to delight with design.