UTC is an atomic clock time reference used to ensure all PCs and computer networks, no matter where they are in the world, are all running the same time. NTP time servers are used to receive a times source and distribute it around a network but there are various choices for locating a source of UTC for time reference for synchronisation.
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![Time reference for PC synchronisation](https://www.exportworldwide.com/en/image/2/326/2/time-reference-for-pc.png)