Welcome!
Red is a server that is dedicated to Player vs. Player (PvP).
Blue is a server (the original) that is decated to Player vs Environment (PvE) or just the content.
Currently, blue is further along in the expansions and has a much greater playerbase. Don't let that stop you from picking a server based on what you want though. Just be aware that you will find it easier to start on blue most likely.
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