what is port 80 used for

Port 80 is a well-known port used for web traffic, specifically for HTTP (Hyper Text Transfer Protocol) connection by default. It is a popular and widely used port across the globe and was introduced by Tim Berners-Lee in 1991 in the HTTP 0.9 document. The document states that if there is no port assigned for HTTP connection, Port 80 is used by default. Port 80 is used to send and receive unencrypted web pages. When a client attempts to connect to a server, it sends a request to the server as examplesite.com:80. Port 80 allows HTTP protocol, which means the information remains in plain text between the browser and the server. It is important to note that Port 80 enables data transmission in plain text, while Port 443 allows data transmission over a secured network.