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NNTP, or Network News Transfer Protocol, is a TCP/IP protocol used to carry USENET newsgroup postings between clients and servers over a network. It facilitates the exchange of articles in Usenet, a worldwide distributed discussion system, allowing users to post and read messages in various newsgroups through clients like newsreaders. NNTP allows Usenet servers to communicate with each other and enables client software to access and participate in these discussions.

How NNTP works

Server to server communication: NNTP allows Usenet servers to share messages with each other, distributing them across the network to ensure a message posted on one server is available to clients on others.

Client to server communication: When a user interacts with a newsreader or another client application, it uses NNTP to connect to a server.

Fetching new messages: A client can download all new messages posted since its last connection to the server.

Posting new messages: Users can create new messages or reply to existing ones, which the NNTP client then sends to the server for distribution.

Message identification: Each message is assigned a unique message ID, which is used for tracking, retrieval, and replies.