The main benefit of using responsive web design is that it allows websites to adapt seamlessly to different screen sizes and devices. This approach enhances user experience by providing optimal viewing and interaction, whether on a desktop, tablet, or smartphone. Responsive design eliminates the need for separate mobile sites, streamlining content management and reducing development costs. Moreover, it positively impacts SEO, as search engines favor mobile-friendly designs. By ensuring accessibility and ease of use across devices, responsive web design helps businesses reach a broader audience and improve engagement.