Hardware integration is the work of making separate physical components function together as one system. In practice, that means matching power, signals, connectors, firmware, drivers, and mechanical fit so each part behaves correctly inside the whole device. In cyber security, integration matters because a secure component can become unsafe if it is attached to an untrusted bus, exposed debug port, or poorly controlled controller.
Attackers often look for integration gaps: mismatched firmware, weak authentication between modules, unused interfaces left active, or older parts that cannot support modern protections. Defenders use careful integration to reduce that risk by validating compatibility, limiting trusted connections, enabling secure boot, and testing how components behave under failure or tampering. In retrofitted devices, such as upgraded cameras or industrial gear, good hardware integration preserves the original function while adding modern capabilities without widening the attack surface.