UI stands for user interface, and user interface design refers to the creation and design of the elements that a user interacts with when using a website or service. This may include buttons, sliders, graphics or other interactive elements. User interface designers work with specific pages and elements of a product or service.The user interface designer is responsible for creating the appearance of the website. Their task is to design the user interface from the user's perspective. They may be given a specific design problem and asked to solve it.