Web & Mobile
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.
Before responsive design, many organisations maintained separate desktop and mobile websites, doubling the effort to update content and keep both versions consistent. Responsive design eliminates this duplication with a single codebase that intelligently reflows content: multi-column desktop layouts might stack into a single column on mobile, navigation menus collapse into hamburger icons, and images resize to avoid horizontal scrolling. Google's mobile-first indexing policy makes responsive design a direct SEO factor — non-mobile-friendly pages are ranked lower in search results. CSS frameworks like Bootstrap and Tailwind CSS provide responsive grid systems and utility classes that help developers implement responsive layouts without writing all the breakpoint logic from scratch.
Example
An e-commerce website uses CSS Grid with responsive breakpoints so product listings display as a 4-column grid on desktop, 2 columns on tablet, and a single column on mobile — all from one HTML and CSS codebase.
Related terms
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.
UI (User Interface)
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.
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.
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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