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COMSEC stands for Communications Security. It encompasses measures and techniques that are implemented to protect communications and ensure that any data transmitted remains confidential and secure from unauthorized access or interference. This includes a variety of practices such as encryption, secure communication protocols, and physical security measures to protect communication devices and networks.

Understanding COMSEC is essential for maintaining operational security in military and intelligence contexts, as it helps prevent adversaries from intercepting and understanding critical information. The other terms listed do not pertain to the specific field of communications security, further solidifying the choice of Communications Security as the correct definition of COMSEC.