Responsive design is a modern web design approach that ensures websites automatically adapt to different devices and screen sizes for the best viewing experience. It adjusts layouts, images, and content so users can easily navigate a site on phones, tablets, and desktops without zooming or scrolling awkwardly. This type of design improves usability and keeps visitors engaged, which can boost conversions and customer satisfaction. Responsive websites also help with search engine rankings because search engines favour mobile-friendly sites. Overall, responsive design creates a seamless, professional online presence that works smoothly on all devices.