Responsive web designs improve user accessibility by providing a flexible layout that adapts to various screen sizes and devices. This approach ensures that websites function seamlessly on desktops, tablets, and smartphones, delivering a consistent and appealing user experience. Techniques such as fluid grids, media queries, and scalable images are employed to adjust content dynamically. By enhancing usability across different platforms, responsive designs contribute to higher engagement, lower bounce rates, and improved SEO performance, ultimately making online content accessible to a broader audience.