its nothing but server. Google has been server accrosed the world. When you use google search, the search will send request to the nearer datacenter mostly so has to have fast results.
Woah! can you tell me what data center you're talking about? if that's so, then your rich as google, are you? agree with hiteshb those are just server and as for now, "there are 36 data centers in all—19 in the U.S., 12 in Europe, 3 in Asia, and one each in Russia and South America. Future data center sites may include Taiwan, Malaysia, Lithuania, and Blythewood, South Carolina, where Google has reportedly bought 466 acres of land." Source