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Why websites using port 80 and 443 for https?

Websites often use port 80 or port 443 because they are the standard ports for the HTTP (Hypertext Transfer Protocol) and HTTPS (Hypertext Transfer Protocol Secure) protocols, respectively.
HTTP is the standard protocol used for transmitting unencrypted web content, and it uses port 80 by default. This means that if you visit a website using an HTTP URL (such as "http://example.com"), your browser will try to connect to the server using port 80.
HTTPS is the secure version of HTTP and is used for transmitting encrypted web content. It uses port 443 by default, which means that if you visit a website using an HTTPS URL (such as "https://example.com"), your browser will try to connect to the server using port 443.
Using standard ports for HTTP and HTTPS makes it easier for browsers and servers to communicate, and it also makes it easier for network administrators to configure firewalls and other network devices. However, websites can use other ports if necessary, although this can cause issues for users who are behind firewalls or other network devices that block non-standard ports.
In summary, websites use port 80 or 443 because these are the standard ports for the HTTP and HTTPS protocols, respectively, and using standard ports makes it easier for browsers and servers to communicate and for network administrators to configure firewalls and other network devices.