What does the command 'rmdir directory_name' do?

The command 'rmdir directory_name' is specifically designed to remove an empty directory. When executed, it checks for the existence of the directory specified. If the directory is empty, it will be deleted. This command is useful for maintaining a clean file system, as it allows users to remove directories that are no longer needed without affecting any files.

It's important to note that if the directory contains any files or subdirectories, the command will fail to execute and will return an error message, indicating that the directory is not empty. Therefore, 'rmdir' is not capable of removing files or directories that have content, which distinguishes it from commands designed for broader deletion tasks. Other options provided would not accurately describe the function of this command.