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Nodejs - Why can Node.js handle a large number of concurrent persistent connections?

I know that Node.js is good at keeping a large number of simultaneous constant connections, for example, in a chat room for many conversations.

I wonder how this is achieved. I mean, in any case, it uses TCP / IP, which is encapsulated by the underlying OS, why can it handle persistent connections so well that others cannot?

What is this magic thing?

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Node.js does all asynchronous I / O. It works in only one thread, but will perform other requests or operations while waiting for I / O.

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