A USB interface is a standard connection method used to link computers and various devices, such as printers, cameras, and external storage. It allows for data transfer and power supply between devices, making it a versatile option for both personal and professional use. There are different types of USB connectors, including USB-A, USB-B, and USB-C, each designed for specific applications. The USB protocol supports various data transfer speeds, ranging from USB 1.0's 1.5 Mbps to USB 3.2's 20 Gbps, enabling efficient communication between devices.