A question about Cloud Computing.

Occasional Visitor
Excuse me, I have a question and I'm sorry if it vague or odd. I'm thankful if anyone reply me clearly.
How a company make a cloud platform and provide service to others? Is Cloud a lot of servers in the world that clustered together? For example, a main server that running a hypervisor like Hyper-V with some VMs and this server clustered with a lot of servers to provide HA service.

Thank you.
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