Internet is connection of various devices around the world each device is identified through its IP address which are connected through routing.In routing there is one common device(router) which pass my data to some other devices viceversa.
Above image is a small example but its huge with so many networks connected together.Below image just show the fraction of internet
Now for example you are taking internet service from airtel then they will bring cable and connect it to your home router from where u can access the internet in the same way airtel is also taking internet from somewhere what i mean to say that there is lot of cabel distribution under earth and ocean to enable the Internet
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