An absolute path is used for an external link. This means that the complete and specific location of the file or resource is provided in the link. It includes the entire path from the root directory to the file or resource, such as "https://www.example.com/page.html". This ensures that the link will work correctly regardless of the current page's location. Relative paths, on the other hand, are used for linking to files or resources within the same website or directory. Rocky road and unknown path are not valid types of paths.