What is a data-center and a server...

How do data-centers differ from servers...

Are the players currently on server get the chance to change to a closer datacenter/server...

The 10 currant servers now based in Japan, Will SE consider in spreading them out to other regions and if so, would player get the option to choose the best option for them.

Thank you for your time, I asked around and just got mix messages. Maybe this is a new brainer for some of you guys.