Definition: The .0420_PCI_imperva.conf file typically describes how a PCI device, or any interface, is configured within an embedded system environment. The file contains various settings like security level, authentication methods, communication protocols, etc., for securing this specific device. The 'PCI' part represents a specific type of PCI bus on the system, which often refers to the Integrated Peripheral Component Interconnect (PCI) bus. In general, these files are used in embedded systems, where they define and manage various security features or functionalities within the system's architecture.