What is OPSEC?

OPSEC, or Operations Security, is a process that identifies critical information to determine if friendly actions can be observed by enemy intelligence, determines vulnerabilities, and selects countermeasures that reduce or eliminate adversary exploitation of friendly critical information. In essence, it's about protecting information that could be used against you. It's commonly used in military, intelligence, law enforcement, and even corporate settings to prevent leaks and maintain security. It involves analyzing one's own activities from an adversary's perspective to identify vulnerabilities.