The main printed circuit board in a computer.
Acts as the connection point where major computer components are attached to. It holds many of the crucial components of the system like the processor, memory, expansion slots and connects directly or indirectly to every part of the PC.
~4min

Motherboard Chipsets
~8min

Expansion Slots: PCI & PCIe, AGP(Accelerated Graphics Port),
PCI Bus (32bit, 64bit) North Bridge / South Bridge
~16min