Responsive design refers to the approach of creating websites and applications that adapt to various devices and screen sizes. It’s important as it ensures a consistent user experience across platforms such as smartphones, tablets, and desktops. Responsive design employs flexible layouts, images, and CSS media queries to dynamically adjust content based on the viewer’s viewport. This adaptability not only enhances user engagement but also improves SEO rankings, as search engines favor mobile-friendly sites. By prioritizing responsiveness, designers can reach a wider audience and accommodate users’ diverse preferences effectively.