We often forget that traveling overseas includes not only ourselves when we are traveling outside of our own country but also people who are travelling inside our country. Our electric or electronic equipment is geared to use the current of our home country.
So while you are traveling, you will often find yourself in need of adaptor plugs and converters to be able to use your computer or phone chargers or electric razors (etc.) while you are away from home. And you know, we must be able to charge our computers and digital cameras no matter where we are.
Each country not only has its own culture and currency, it also has itself own voltage. There are just two basic currents (we are talking wall plugs) that are common in the world today. In North America, the 100-125 volt system is the basic current. In Europe, South America and some other parts of the world, use 220 - 250 volt system. In Japan where the system is geared to 100volt, it may be a little low for most American appliances.
If you are traveling to a 220-250V country, you may need a transformer or converter along with adapter plugs.
Whichever way you will be traveling, if you are taking along electric as well as electronic equipment (hair dryers, travel irons, international cell phones, computers), you need to verify what the voltage and wattage of your destination so you can take the correct tools with you for conversion to power.
This will enable you to relax and use your favorite hair dryer or so, without damage to yourself or your equipment.