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Internet and TCP/IP service that maps network addresses , for example, 128.230.117.25, to an easy to remember names, such as merkury.npac.syr.edu
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TCP/IP tools (like telnet, ftp, smtp) access DNS to locate names and resolve them into IP addresses
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Names and numeric addresses are stored in many locations in a hierarchical structure. Each site has a domain name server that maintains information about the local hosts
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Unix: /etc/hosts
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Windows NT: \WinNT\system32\drivers\etc\hosts
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127.0.0.1 localhost
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128.230.117.25 merkury.npac.syr.edu merkury
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