Responsive Design

Responsive design is a web development approach where layout and content adapt to different screen sizes and device contexts from a single codebase. It matters because users switch between mobile, tablet, and desktop, and poor cross-device usability increases bounce and conversion friction. Effective responsive design includes flexible grids, scalable media, readable typography, and touch-friendly interaction patterns. Teams should test key journeys on real devices, not only browser emulation, to catch practical usability problems. A common mistake is treating responsive behavior as a visual tweak instead of a full interaction and performance requirement.