What are "Motherboard functions"?

The motherboard of any computer that follows the IBM design scheme performs several major fuctions.at the most basic level it is the physical foundation of the computer.it holds the expansion boards in place,provides firm territory to attach connections to external circuit elements,and provides the base of support for the cerntral electronics of the computer. Electrically,the circuitry etched upon it includes the brain of the computer and the most important elements required to nourish that brain.This circuitry determines the entire personality of the computer how it functions,how it reacts to your every keystroke,what it does.