Interfacing is the design of circuitry between devices it shifts levels of voltage and current to allow for compatibility between devices. An example of this would be in a TTL to CMOS interface which requires a pull up resistor to adjust the voltage and current flow so that a CMOS device can be operational since TTL and CMOS have different current requirements. Interfacing is a boundary between which two different components can exchange information, this exchange can be between software numerous software, hardware or even a human component and peripherals. Some interfacing can be duplex sending data both ways, however some interfacing can be simplex or one way sending information only in one direction an illustration would be a mouse or joystick.
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