What does an internet servuce provider do (ie technically speaking)?
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Anyone can technically build and connect up their own part of the internet so long as they follow the rules.
The problem is how do you run cables to connect to the rest of the internet? Running Fiber Optics between towns and cities and houses can be very expensive.
That’s what ISPs do, they run and maintain physical cables and connectivity to the internet that they in turn rent to their customers.
Telcos and Cable companies became the big ISPs because they had the benefit of already owning cables (telephone and Cable TV) that ran into lots of peoples homes.
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