Responsive web design is significant for mobile users as it ensures that websites adapt seamlessly to various screen sizes and devices. This adaptability enhances the user experience by providing consistent navigation and readability, regardless of whether a user is on a desktop, tablet, or smartphone. As mobile usage continues to rise, having a responsive design is crucial for retaining visitors, improving search engine rankings, and increasing conversion rates. Ultimately, responsive web design promotes accessibility and engagement, ensuring users can interact with content efficiently across all devices.