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MUDG > Introduction > Terminology
Terminology
The following terms define objects and concepts related to an ICE OS installation. The objects and concepts herein are not unique, but specific enough that you may benefit from a brief definition.
Online vs air gap:
An online server has internet access and so can pull ICE packages from online repositories. An air gapped server operates 'offline' (without an internet connection), which is desirable for situations where internet connectivity is either unreliable or unwanted.
Geo-redundancy: 
A geo-redundant server consists of two synchronized data centers, placed in different geographic locations. This safeguards against service disruptions due to catastrophic events or natural disasters, and supports traffic load balancing for optimizing performance.