Quote Originally Posted by Rachma View Post
How you can even DC transfer to other countries tell me because it's what I understand, or maybe is from one world servers to an other one world servers from of the same country? like for EU Light and Chaos?
If you mean DC travel that I mentioned prior, then when you're in character selection menu, open context menu for the character you're going to log in with, and there will be an option to travel to a different DC. It works within the region, and all regions can travel to OCE servers.

There's a fairly comprehensive guide here: DC Travel Guide on Lodestone.

DC travel allows you to play on a different data center without doing a permanent transfer, which can be very handy if you're planning to raid or if your friends are from different server. It does have some limitations, which are listed in the guide above.