Responsive web design is a design approach that ensures a website's layout, images, and other elements adjust seamlessly across different devices and screen sizes, from desktops and laptops to tablets and smartphones. It relies on flexible grids, media queries, and adaptable components to maintain usability and visual appeal, regardless of the device used to access the site. Responsive web design is important because it provides a consistent user experience, which is crucial in today's multi-device world. It also impacts search engine optimization (SEO), as search engines like Google prioritize mobile-friendly websites. By adopting responsive design, businesses can improve user engagement, reach a broader audience, and reduce the need for separate mobile sites, ultimately saving time and resources.