The world runs on two types of electricity: 110/125V or 220/240V. North American devices run on 110/125V electricity while the majority of the world runs on 220/240V. Converters and transformers change the voltage of electricity to match the voltage of your device. OK, forget I said that because unless you’re traveling with an old hair dryer or old iron (time to say goodbye to those dinosaurs) you won’t need a converter.
There are 4 major outlet types and we add a couple others for your convenience (We rock don’t we?). If you’re traveling to Japan, Taiwan, Central America, Caribbean and South America an adapter is NOT needed (Type A and B Outlets). Otherwise, travelling internationally you will need an electrical adapter to power up your US based electronics.