What is the purpose of the 'ShowConfig.aspx' page?

The 'ShowConfig.aspx' page serves the important function of displaying the entire compiled Sitecore configuration. This is particularly useful for troubleshooting issues within the Sitecore environment. When administrators or developers encounter unexpected behavior or performance issues, they can visit this page to review the complete configuration settings applied to Sitecore. This transparency allows for better understanding and diagnosis of the system's behavior, as it outlines how different settings and configurations are layered and ultimately resolved.

While other options touch on relevant functionalities within Sitecore, they do not serve the specific purpose of compiling and displaying the detailed configuration. Managing user permissions and updating modules are different administrative tasks that do not involve the direct display of Sitecore's configuration settings, which is why the choice referring to the compiled configuration is the most accurate.