Kinds of links

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This assumption gives us enough information to distinguish different kinds of links.

• back link - A back link is a link to a page that is more general, that is, to a page in a parent directory.
• side link - A side link is a link to a page in an unrelated directory which is neither a parent directory nor a subdirectory, e.g., a link to a page on a different server, or from a page in the server's root directory to one in a user's public_html directory.
• down link - A link from a parent to a subdirectory is called a down link. A down link leads from a more general to a more specialized page.