What is the Master Server?

[Jeep Gladiator]

The "Master Server" is down. What does that mean. I have some what of an idea. But i don't want to walk around acting like i know what it is. What happens now that its down?

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[Marcem]

It is how you log in the game, it's back up.

[Jeep Gladiator]

Thanks Marcem.