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In a web site, the root directory is the root for the site, NOT the root directory for the disk (usually C:\). The server root is the highest level directory that is read by the server, and therefore the highest level directory that can be accessed by remote browsers. The root is set by the server software, and all directories for the site must be subdirectories of the root. In a domain name- The top of the Domain Name System (DNS) hierarchy. Often referred to as the "dot."

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