Definition - What does Port 80 mean?
Port 80 is the port number assigned to commonly used internet communication protocol, Hypertext Transfer Protocol (HTTP). It is the port from which a computer sends and receives Web client-based communication and messages from a Web server and is used to send and receive HTML pages or data.
Techopedia explains 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.
Alternatively, HTTP may use port 8080, rather than port 80, typically to deploy a caching or proxy server.