What does "parallax scrolling" refer to in web design?

Parallax scrolling refers to a web design technique where the background elements of a webpage move at a different speed than the foreground elements as the user scrolls down the page. This creates an illusion of depth and immersion, providing a more engaging visual experience. The foreground content typically scrolls faster than the background content, enhancing the perception of movement and depth, which can make a webpage more dynamic and visually appealing.

The other choices do not accurately reflect the concept of parallax scrolling. For instance, making pages scroll faster pertains more to load optimization or technical adjustments rather than the specific visual effect of depth created by parallax scrolling. Coding practices for responsive design involves creating layouts that adapt to various screen sizes, which does not directly relate to the parallax effect. Finally, reducing webpage size is associated with performance optimization, such as minimizing loading times, rather than the unique aesthetic appeal that parallax scrolling provides.