What does it mean to mirror a directory structure on a web server?

Mirroring a directory structure on a web server refers to creating a similar file organization on both local and web environments. This means that the way files and folders are arranged locally (on a developer's computer, for example) will be replicated on the web server where the website is hosted. This is important for various reasons, such as ensuring that links to files, scripts, images, and other resources function correctly when the website is accessed online. A consistent directory structure helps developers manage their files more easily and reduces the chances of errors when deploying updates or changes to a web application.

The other options focus on aspects that do not directly relate to the directory structure. Duplicating web server settings, using the same web server software, or maintaining a single file type across platforms does not address the concept of mirroring in the context of file organization and accessibility.