My Question is how do ISPs provide Internet and that too with different bandwidths. And like is there a central system controlling the whole ‘Internet’?
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You can think of the internet like a global network of roads. Internet users need the ability to travel to (communicate with) anywhere in the world.
Your ISP builds all the local roads and larger ISPs also have their own roads that span the country. Then there are companies that build and maintain roads that connect different countries and even continents to each other. Your ISP pays these companies (called tier 1 carriers) to get access to their international roads so customers of this ISP can use them.
So there’s no central internet as such, just like there’s no global main road.
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