What an air gap is
An air gap is a security measure in which a computer or network is kept physically isolated from unsecured networks, such as the public internet. The name comes from the idea that there is a gap of air, meaning no network connection, between the protected system and anything untrusted. This isolation is used to protect especially sensitive systems from online threats.
Isolation for protection
The purpose of an air gap is protection through isolation. If a system has no connection to outside networks, then attackers on those networks have no direct path to reach it. This can greatly reduce the risk of remote attacks, since many threats rely on network access. The air gap creates a strong barrier by simply removing that connection.
Where air gaps are used
Air gaps are typically used for systems that are highly sensitive or critical, where the consequences of a breach would be severe. By keeping such systems disconnected, organizations aim to shield them from the many threats that travel over networks. This makes the air gap a measure reserved for situations that demand an especially high level of protection.
Limits and trade-offs
While an air gap is a strong protection, it is not perfect and comes with trade-offs. Isolating a system makes it less convenient to use and update, since data cannot simply flow over a network. There are also ways attackers may try to bridge an air gap. Understanding these limits is important, as an air gap reduces but does not entirely eliminate risk.
Why air gaps matter
Air gaps matter because they offer a powerful way to protect the most sensitive systems by cutting off network-based attacks. They represent a clear example of security through isolation. Understanding what an air gap is clarifies how physically separating a system from untrusted networks can provide a strong, if demanding, layer of defense.
Why it matters
The air gap is a notable security measure. Understanding what it is - isolating a system by disconnecting it from unsecured networks - clarifies a strong form of protection for sensitive systems. For anyone interested in cybersecurity, it is a valuable concept to understand.
Related on Skillo
See also: What is defense in depth? Explained, What is an attack surface? Explained.
Sources
Published date reflects the original event date (2026-10-22). This article is original Skillo editorial written from the sources above; facts were verified in September 2026.
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