Their are two bridge found in motherboard the north bridge and the south bridge. North bridge found near the CPU and south bridge found near the BIOS.
north and south bridge of a motherboard
The South Bridge controls the drives and the on board devices.
The north bridge controls pci, pci express, agp, and other cards, and south bridge controls the drives and onboard devices.
they are both bridges
North Bridge: CPU, Memory, GPU South Bridge: I/O devices, keyboard, mice, NIC card
North bridge connects the processor, memory and video card. South bridge connects all the peripherals whether it is connected using USB, ISA, and PCI connector. Note. South Bridge is also connected to north bridge
I am assuming you mean North Bridge\ South bridge North Bridge is the Memory Controller, that transfers data and instructions between the CPU ,RAM and PCIe Devices. South Bridge is the Storage Controller that controls how data is transferred onto Storage Devices(Hard drives)
part of motherboard
Input Device (mouse) sent through the motherboard -> Processor -> RAM -> South Bridge -> North Bridge -> Graphic interface (video card)
function of the processor is to process data