Why can multiple websites share port 80 on the IIS server?

Source: Internet
Author: User
Why can so many websites share port 80 on the IIS server? doesn't it mean that only one website can use port 80 on one machine, but I found on this server that, A lot of websites share port 80. do you understand that a service process uses port 80 instead of a website? a service process can have N virtual websites, why can so many websites share port 80 on the IIS server?
Isn't it true that only one website can use port 80 on one server? but I found that many websites share port 80 on this server. I am wrong.

------ Solution --------------------
A service process uses port 80
Instead of a website
A service process can contain N virtual websites
------ Solution --------------------
Port 80 is used to access iis services externally.
The iis service has a virtual host .. Then access the host through this

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