To add to the plug socket discussion, we also have a different voltage system in Europe, compared to North America. Over here plug sockets are usually 210~230 V output, compared to NA's 110 V output. So if you plug something designed only for 110 V input straight into a European plug socket, you'll just fry it (literally; it would be a fire risk), and you'll need a stepdown converter for it to work properly here. The reverse situation (plugging an EU appliance into a NA socket) will result in the appliance simply not getting enough power to run properly, in which case you need a stepup converter (but at least it probably won't go on fire).
That said, most modern electronics are designed to accept both inputs, so you can just buy a bog-standard adapter and it should work fine. But of course it's still worth checking these things out just to be sure; one example of something that won't work in both regions is the Wii U (not that many people will be travelling with that thing anyway), but the Switch should work fine. If you check the plug or power brick, it should say something like "Input: 110-240 V", which would mean it will work fine in both regions; if it only says 110 or 240 V input, however, it will probably not work without the proper adapter.
Oh brother... Not again.
