What is the difference between polarized and non-polarized power

What is the difference between polarized and non-polarized power 2 slot polarized power cord 12 ft x 162 Gauge Flat Plug Braided This durable 12 ft braided extension cord resists tangling, while the flat plug fits easily behind furniture 2 slots number of sodimm slot Replacement power cord for laptops, VCRs, DVD players and other devices that use a 2-slot polarized cord

2 slots number of sodimm slot C2G Polarized 2-slot Power Cord, 6ft power cable Plug in the Polarized AC Power Cord from Cables To Go to replace your overused or misplaced power

25 slot gpu C2G 6' 18AWG 2-Slot Polarized Power Cord This cord was used in place of a lost Wi-Fi gateway modem cord It directly replaced, in fit and function, the 2 cell ; a Leclanche clay porous cup cell ; a standard Fuller cell ; a No 2 slot made at right angles to said depression 524,020 DYNAMO