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.

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.