A key feature of responsive web design is its ability to adapt the layout and elements of a website to various screen sizes and devices. This ensures an optimal user experience across desktops, tablets, and smartphones. Responsive design employs fluid grids, flexible images, and CSS media queries to adjust content dynamically. By providing a seamless browsing experience, responsive design enhances accessibility and usability, increases engagement, and improves search engine rankings, which are essential for modern web strategies.