port 80 means code example

Example 1: port 80

Port 80 is one of the most commonly used port numbers in the
Transmission Control Protocol (TCP) suite. 
Any Web/HTTP client, such as a Web browser, uses port 80 to send 
and receive requested Web pages from a HTTP server. It manages
all HTTP-based requests that originate from a computer, regardless 
of the number of requests and initiating Web clients. 
Similarly, the HTTP server responds to all requests received at port 80.

Example 2: what is port 80 used for

Port 80 is one of the most commonly used port numbers in the
Transmission Control Protocol (TCP) suite. Any Web/HTTP client,
such as a Web browser, uses port 80 to send and receive requested
Web pages from a HTTP server. It manages all HTTP-based requests
that originate from a computer, regardless of the number of requests
and initiating Web clients. Similarly, the HTTP server responds to
all requests received at port 80.