The South Bridge is a key component of a computer's motherboard, specifically part of the chipset. It connects the CPU to various peripherals and manages data flow between them. This includes communication with devices like USB ports, audio controllers, and network interfaces. In contrast to the North Bridge, which handles high-speed connections like RAM and graphics cards, the South Bridge focuses on slower, but essential, input/output operations. Together, these two bridges facilitate efficient data processing and overall system performance in computers and other electronic devices.