Alas, voltage is not universal. For example, the voltage in many parts of the world is 220-240, while it’s 110-120 in North America. If you’ll be plugging in any devices or gadgets (laptops, phones, iPads, hair dryers, cameras, etc.) it’ll pay to know what the voltage in your destination is. And don’t always rely on your converters to convert the voltage (some will do the trick but be sure they can convert voltage as well as hertz). I had to learn the hard way when I first went to Paris when I was 18. Without going too much into detail, let’s just say…R.I.P. Hot Tools straightener and hello frizzy, curly hair. My recommendations: buy a universal adapter (these do not change the voltage), look for dual/universal voltage appliances, and/or buy local gadgets/appliances. If you happen to forget an adapter, you can either buy it on-board the plane, in the duty-free shops, or ask the front desk of your hotel.