The folder at the top of the file system hierarchy. This folder is represented by a slash (/). It is physically located on the startup disk.

(WebDB Tutorial Guide; search in this book)

The topmost folder on a server; the folder that is the parent of all folders on a server. Usually represented in folder listings as "/" (a slash). The root folder may be different from the topmost folder you have access to — for example, on a web server, you may not have access to the parent folders of your website's folder, even though there are folders enclosing it. The root folder is sometimes just called "root" or even "/" (slash).