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Either I'm not making myself clear enough or perhaps I'm not wording it correctly, but if you unplug your router, you can't visit TS because you have no signal. Have a good dayWell the signal that gets you to where you want to go comes from that domain. Like others have said in that respect the Internet is a massive inter connecting web of computers and devices. As far as where that ability to traverse this massive web. I.E our internet connection. There really are physical lines that run all across the world including under oceans, not just one line mind you. These are what are known as the backbone lines, there massive bandwidth capabilities allow the trillions of bits of data that are flowing constantly to get to where they are going. Then we have tier 1 providers that collectively help manage the traffic in these lines and are all in contact with eachother. They are the ones that sell the signal/bandwidth to your ISP for you to use. Keep in mind that some of the tier 1 providers are ISPs themselves. For instance in the U.S AT&T and Verizon are both tier 1 providers. Some helpful search terms you might want to Google would be "internet backbone" "tier 1 providers" "tier 1 backbone line" I'm not sure if this answered your question exactly but for the very least if your wondering where your ISP gets internet from then these tier 1 providers are as high as the chain of command goes. As others posted though nothing is centralized none of these providers own the Internet or any sort of thing like that and they have nothing to do with the content within the web, it's more about routing all that data. In the same way the road you take to get the grocery store has nothing to do with what they are selling but you needed the road to drive on for you to get there.