Final answer:
An ESS is a component of an overall physical protection system.
Step-by-step explanation:
A physical protection system can refer to a system designed to protect a facility or area from unauthorized access or any potential threats. An essential component of such a system is an Electronic Security System (ESS), which includes various devices like cameras, alarms, sensors, and access control systems. Therefore, an ESS is indeed a component of an overall physical protection system. Hence, the statement is True.