What is a proxy server in Aion?

I want to play on a U.S. server, but I'm in the UK and people are talking about a proxy server and I do not know what it is

A proxy is "A person authorized to act on behalf of another, an agent or substitute." In this case, it would be a server located in the U.S.. Your IP to show that they are in the U.S., so you can play on the U.S. version Aion. It seems to be an IP block created right now, so that U.S. players can not play the UK version, and vice versa. From now on, this is not immutable. There is still hope that it will be scrapped.

Aion PvP – Sorcerer Solo Rifting – Part 1