The significance of responsive design in websites lies in its ability to provide an optimal viewing experience across various devices, such as desktops, tablets, and smartphones. This design approach ensures that content is easily readable and navigable regardless of screen size, improving user experience. As mobile internet usage grows, responsive design is crucial for search engine optimization (SEO), influencing search rankings. Ultimately, it allows businesses to reach a broader audience while maintaining brand consistency and enhancing accessibility, which is vital for engagement and conversion rates.