Glossary
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U
UTC Coordinated Universal Time. The International Atomic Time (TAI) with leap seconds
added at irregular intervals to compensate for the Earth’s slowing rotation. Leap seconds
are used to allow UTC to closely track UT1, which is mean solar time at the Royal
Observatory, Greenwich.
V
VoIP Voice over IP. The routing of voice conversations over the Internet or through an IP-
based network.
VPN Virtual Private Network. A network that is constructed by using public wires to connect
nodes. You can create networks using the Internet for transporting data, using security
mechanisms so that only authorized users can access the network.
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