Pure is elegant, simple, and lightweight. It is very easy to work with. The biggest advantage of using Pure CSS is it is built to be extensible. You can simply add a few styles in your own CSS and change the look to your website.

In the context of Pure.CSS, “extensible” refers to the ability of the framework to be easily customized and extended to meet specific design requirements or preferences. This means that Pure.CSS provides a solid foundation of styles and components that can be easily modified or built upon without having to overwrite existing styles or hack the framework.

The correct answer could elaborate on the following points:

Modularity: Pure.CSS is structured in a modular way, allowing developers to include only the necessary components for their project, which reduces bloat and improves performance.
Customization: Pure.CSS offers various customization options, such as variables for colors, typography, spacing, and more. This allows developers to tailor the look and feel of their websites or applications to match their brand or design preferences.
Extension: Developers can extend Pure.CSS by creating their own custom styles or by integrating additional CSS libraries or frameworks seamlessly. This flexibility enables developers to incorporate unique design elements or functionality without reinventing the wheel.
Community Support: Pure.CSS has an active community of developers who contribute plugins, extensions, and resources that further enhance its capabilities. This community-driven approach ensures that Pure.CSS remains adaptable to evolving design trends and requirements.

Overall, in an interview context, emphasizing how Pure.CSS facilitates easy customization, modularity, and extension to accommodate diverse design needs would provide a strong answer.