What does the term "responsive design" refer to?

Responsive design refers to the approach in web design that makes websites adaptable to various screen sizes and resolutions, ensuring an optimal viewing experience across a wide range of devices, from desktop computers to smartphones and tablets. This adaptability is achieved through the use of flexible grid layouts, images, and CSS media queries, allowing the content to reflow and resize according to the screen dimensions.

This concept is crucial in today's digital landscape, where users access content from multiple devices. As a result, a website designed with responsive principles can maintain usability, readability, and accessibility regardless of the device being used. This enhances user engagement and can improve SEO rankings since search engines favor sites that offer a good user experience on all devices.

The other choices do not capture the broad intent of responsive design. Designing only for mobile devices does not encompass the varied screen sizes and devices users interact with. Apps that use less memory focus on performance and efficiency rather than adaptability to screen sizes. Developing graphics that adjust color intensity does not pertain to layout or screen size responsiveness, but rather to visual presentation.