To improve a website’s layout for a different screen size, which design concept is typically implemented?

Responsive Design is the most effective approach for improving a website's layout across various screen sizes. This design concept utilizes flexible grids, layouts, and media queries to ensure that a web page adapts dynamically to different devices, whether it is a smartphone, tablet, or desktop. By using relative units like percentages rather than fixed units like pixels, responsive design maintains a consistent user experience regardless of the device's resolution or orientation.

The adaptability of responsive design not only enhances usability but also helps with SEO, as search engines favor mobile-friendly sites. In contrast, fixed layout designs set specific widths that do not adjust according to the user’s screen, which can lead to horizontal scrolling on smaller devices. Fluid layout design adjusts elements in a flexible manner but may not be as precise in handling various screen sizes as responsive design. Adaptive design, while also effective, typically involves creating multiple versions of a site tailored to different devices, which can be more resource-intensive. Thus, responsive design stands out as the most universally applicable method for optimizing a website’s layout for diverse screen sizes.