Motherboard are main part through which Computer works. Motherboard has all the connections for other devices, docking station/ ports, and components as Processes, Ram Slots, Graphic Card slot, Expansion slots, etc. It is connected to SMPS(Switch Mode Power Supply). If Motherboard has capacity of performance then and then the processor or RAM performance is achieved otherwise the RAM power is waste.
Motherboard is commonly known as PCB ( Printed Circuit Board). PCB has pipeline system for connections. If viewed from top it looks like watching maps. Due to PCB technology the motherboards have become thin in size and this resulted in slimmest TV, Smartphone, Ultrabooks, etc. production easy.