Every directory except for the top-level root directory is a subdirectory of at least one directory. The list of parent directories of a directory or file is called its path.
The following is an example of a file's path, including its parent directories, in Microsoft Windows.
In the following example path in a Linux operating system, public_html is a subdirectory of computerhope, which is a subdirectory of c, etc. The special root folder / is the only directory that is not a subdirectory, because it has no parent directory.
Like a subdirectory, a subfolder is any folder that is a child of another folder. In the example below, Fonts and System32 are subfolders of the Windows folder.