Alternatively referred to as a power cable, mains cable or flex, a power cord is the primary cable that provides power to the Laptop power adapter. In the image to the right, is an example of the power cord that is commonly used with computers, monitors, printers, and other peripherals.
It is the cable that will bring electricity from a suitable source (straight 110/220volt Ac or 5 to 19v DC from an adapter) to your computer. To power it. To make it work.