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Network Time Protocol (NTP) is an Internet protocol used for the transfer of accurate time, providing time information so that a precise time can be obtained and maintained on a network. Most UNIX and Linux operating systems provide built-in time synchronisation functionality with its NTP (Network Time Protocol) daemon. If the NTP service is not available on your version of UNIXLinux, NTP version 4 is open source and can easily be downloaded and configured, compiled and installed.