This whitepaper explains the importance of ISA/IEC 62443 compliance for securing Industrial Automation and Control Systems and Operational Technology that underpin critical infrastructure worldwide. These systems support essential services such as electricity, oil and gas production, water and wastewater management, transportation, chemical processing, pharmaceuticals, food and beverage production, and manufacturing sectors like automotive and aerospace. As industrial environments increasingly adopt Industrial Internet of Things devices, sensors, actuators, and programmable logic controllers, cybersecurity risks grow alongside connectivity. The ISA/IEC 62443 standard provides a structured framework to address these risks by defining security requirements across people, processes, and techn

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