What is a responsive web design framework?

A responsive web design framework is fundamentally a pre-designed set of HTML, CSS, and JavaScript components that facilitate the creation of websites which adapt seamlessly to differing screen sizes and device capabilities. This adaptability is crucial in today's multi-device environment, where a website must function well on smartphones, tablets, and desktops.

Using such a framework allows developers to implement responsive design principles more easily, ensuring that web content is accessible and user-friendly across all devices. Frameworks often come with grid systems, layout components, and styles that help maintain overall coherence in design while making the site responsive.

In contrast, the other options refer to concepts that do not align with the definition of a responsive web design framework. A coding language does not inherently provide components for responsive design; SEO tools focus on search engine optimization rather than responsive interfaces, and methods for creating static web pages do not address the dynamic adaptability that responsive design frameworks offer. Thus, the pre-designed nature of HTML, CSS, and JavaScript components in a framework is what makes it effective for responsive web development.