Every directory on a Unix system (and probably every other system too) contains at least two directory entries. These are . (current directory) and .. (parent directory). In the case of the root directory, these point to the same place, but with any other directory, they are different. You can see this for yourself using the stat, pwd and cd commands (on Linux): $ cd / $ stat . .. bin sbin ...
The path meanings: / is the root of the current drive; ./ is the current directory; ../ is the parent of the current directory.
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Check "The folder metaphor" section at Wikipedia. It states: There is a difference between a directory, which is a file system concept, and the graphical user interface metaphor that is used to represent it (a folder). For example, Microsoft Windows uses the concept of special folders to help present the contents of the computer to the user in a fairly consistent way that frees the user from ...
directory - What are ./ and ../ directories? - Unix & Linux Stack Exchange