The Network News Transfer Protocol (NNTP) is a protocol used for the distribution, retrieval, and posting of Usenet articles. It allows users to read and post messages on newsgroups, which are organized discussions on various topics. NNTP operates over the Internet and is designed to efficiently handle large volumes of messages. NNTP works by enabling news servers to communicate with each other and with client applications. Users can access newsgroups through software known as newsreaders, which connect to NNTP servers to download and upload articles. This protocol is essential for maintaining the flow of information in the Usenet community.