What defines responsive web design?

Responsive web design is defined as an approach that makes web pages render well on a variety of devices and screen sizes. This approach incorporates flexible layouts, images, and CSS media queries, allowing the website to adapt and provide an optimal viewing experience across different devices—from desktops to tablets and smartphones.

The essence of responsive design lies in its fluidity; it adjusts elements to fit the screen size and orientation, which enhances usability and user experience. By considering the numerous types and resolutions of devices available today, responsive web design ensures that content is accessible and appears consistently, regardless of the device being used.

The other options do not capture this concept accurately. Fixed dimensions would mean a lack of flexibility and adaptability, which contradicts the definition of responsive design. Focusing solely on mobile devices neglects the needs of users on larger screens. Additionally, while specific coding languages can be used in responsive web design, the concept does not rely on any one language specifically, but rather on how these languages are applied to create a flexible and adaptive layout.