Responsive interfaces are designs that adapt to different screen sizes and devices, ensuring a consistent user experience. This means that whether you are using a smartphone, tablet, or desktop computer, the layout and functionality of a website or application will adjust accordingly. The goal of responsive design is to make content easily accessible and visually appealing, regardless of the device being used. Techniques such as flexible grids, images, and CSS media queries are commonly employed to achieve this adaptability, enhancing usability for users across various platforms and devices.