Merge pull request #2772 from replicatedhq/define-airgap

Add air gap FAQ

Author: paigecalvert

docs/vendor/kots-faq.mdx

@@ -42,6 +42,20 @@ The following getting started tutorials demonstrate how to integrate key Replica
 * [Set Helm Chart Values with KOTS](/vendor/tutorial-config-setup): Configure the Admin Console Config screen to collect user-supplied values. 
 * [Add Preflight Checks to a Helm Chart](/vendor/tutorial-preflight-helm-setup): Create preflight checks for your application by addin a spec for preflight checks to a Secret in the Helm templates.
 
+### What are air gap installations?
+
+_Air gap_ refers to a computer or network that does not have outbound internet access. Air-gapped environments are common for enterprises that require high security, such as government agencies or financial institutions.
+
+Traditionally, air-gapped systems are physically isolated from the network. For example, an air-gapped server might be stored in a separate location away from network-connected servers. Physical access to air-gapped servers is often restricted as well.
+
+It is also possible to use _virtual_ or _logical_ air gaps, in which security controls such as firewalls, role-based access control (RBAC), and encryption are used to logically isolate a device from a network. In this way, network access is still restricted, but there is not a phyiscal air gap that disconnects the device from the network.
+
+Replicated supports installations into air-gapped environments. In an air gap installation, users first download the images and other assets required for installation on an internet-connected device. These installation assets are usually provided in an _air gap bundle_ that ISVs can build in the Replicated Vendor Portal. Then, users transfer the installation assets to their air-gapped machine where they can push the images to an internal private registry and install.
+
+For more information, see:
+* [Air Gap Installation with Embedded Cluster](/enterprise/installing-embedded-air-gap)
+* [Installing and Updating with Helm in Air Gap Environments (Alpha)](/vendor/helm-install-airgap)
+
 ### What is the Commercial Sotware Distribution Lifecycle?
 
 Commercial software distribution is the business process that independent software vendors (ISVs) use to enable enterprise customers to self-host a fully private instance of the vendor's application in an environment controlled by the customer.