The significance of mobile responsiveness in web design lies in its ability to provide an optimal user experience across various devices, particularly smartphones and tablets. With an increasing number of users accessing the web through mobile devices, responsive design ensures that websites automatically adjust their layout, images, and content to fit different screen sizes. This adaptation enhances usability, improves load times, and reduces bounce rates, which can positively impact SEO rankings. Overall, mobile responsiveness is crucial for attracting and retaining users in a digital landscape where mobile browsing continues to rise.