What does the term "responsive design" refer to?

The term "responsive design" refers specifically to a design approach that allows a website to adapt to various screen sizes and resolutions seamlessly. This design methodology ensures that the layout, images, and user interface elements adjust fluidly to fit the screen, whether it's a smartphone, tablet, or desktop computer.

The principle behind responsive design is to provide an optimal viewing and interaction experience across a wide range of devices, promoting usability and accessibility. By employing flexible grids, fluid images, and media queries, responsive design aims to enhance user experience, regardless of the device being used.

In contrast, design focused only on mobile devices overlooks the necessity of accommodating different screen sizes, while a layout exclusive to desktop users would not provide the versatility required by modern web browsing habits. The option that indicates a design that changes based on user input does not capture the core concept of responsiveness, which is primarily about adapting to various screen dimensions rather than interactive elements.