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The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over variable-latency data networks. In operation since before 1985, NTP is one of the oldest Internet protocols in current use.

NTP is intended to synchronize all participating computers to within a few milliseconds of Coordinated Universal Time (UTC). NTP can usually maintain time to within tens of milliseconds over the public Internet, and can achieve better than one millisecond accuracy in local area networks under ideal conditions.

NTP servers, of which there are thousands around the world, have access to highly precise atomic clocks and GPS clocks. Specialized receivers are required to directly communicate with the NTP servers for these services. It is not practical or cost-effective to equip every computer with one of these receivers. Instead, computers designated as primary time servers are outfitted with the receivers, and they use protocols such as NTP to synchronize the clock times.