Interface ICs are integrated circuits responsible for signal transmission, level conversion, isolation, protocol conversion and data exchange between different electronic modules, systems or devices. Common types include transceivers, drivers, isolators, level shifters, bus interface chips and port expanders, supporting interfaces such as UART, SPI, I2C, USB, CAN, Ethernet and LVDS. They are widely used in communications, industrial control, automotive electronics and consumer electronics to ensure stable and compatible interconnection between circuits.