What Does Air Gap Mean?
An air gap is a security measure that isolates a digital device component or private local area network (LAN) from other devices and networks, including the public internet. An air gap is also known as an air wall and the strategy of using air gaps to protect critical data is also known as security by isolation.
Techopedia Explains Air Gap
Air-gapped systems are computers or networks typically contain highly-sensitive or business-critical data.