The significance of responsive design in web development lies in its ability to ensure that websites function optimally across a range of devices, including desktops, tablets, and smartphones. A responsive design adapts the layout, images, and content according to the user’s screen size, enhancing the overall user experience. This adaptability not only improves accessibility but also boosts search engine rankings, as search engines favor mobile-friendly websites, making responsive design a crucial component in modern web development strategies.