Process & Design
UI (User Interface) refers to the visual and interactive elements of a software application through which users engage with the system, including buttons, forms, typography, colour, layout, and navigation structures.
UI design translates the functional requirements of an application into a visual language that communicates hierarchy, affordance, and state to users — making it immediately clear where to click, what has happened, and what will happen next. Good UI design follows principles such as visual consistency (similar elements look and behave the same), feedback (the system confirms every user action), and minimal cognitive load (users are not forced to memorise information between steps). The UI is implemented using design tools like Figma for prototyping and CSS/component libraries for production code, and must account for accessibility standards (WCAG) to be usable by people with visual, motor, or cognitive impairments. UI and UX are complementary: UX defines what the interface should do and how flows are structured, while UI determines what it looks like and how polished the interaction feels.
Example
A banking app redesigns its transfer UI by reducing the form from nine fields to four, adding a favourites list for frequent recipients, and displaying a confirmation summary before submission — reducing transfer errors by 35%.
Related terms
UX (User Experience)
UX (User Experience) is the holistic quality of a person's interaction with a product — encompassing ease of use, efficiency, accessibility, emotional response, and satisfaction — shaped through research, information architecture, and iterative design.
Frontend
Frontend refers to the client-side layer of a web or mobile application — everything the user sees and interacts with directly, including layout, visual design, navigation, and interactive behaviour rendered in the browser or on the device.
Responsive Design
Responsive design is a web design approach in which layouts and content automatically adapt to fit any screen size — from large desktop monitors to tablets and smartphones — using fluid grids, flexible images, and CSS media queries.
PWA (Progressive Web App)
A PWA is a web application that uses modern browser APIs to deliver app-like experiences — including offline access, push notifications, and home screen installation — without requiring download from an app store.
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