A countermeasure in the cybersecurity world, is an action, procedure, or technique that decreases the likelihood of an attack by minimizing either the harm it can cause or the likelihood that it will occur.  Countermeasures are essentially risk reduction strategies that a business can put in place to eliminate or reduce the threats and vulnerabilities to them.

Related Terms: Attack, Threat, Vulnerability

Source: RFC 2828

To learn more about common Cybersecurity Countermeasures (aka best practices) watch this video.
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