A newsgroup system on-line is a type of online discussion forum that is part of the USENET network. It allows users to post messages and read messages posted by other users in a variety of topics. The USENET network was created in 1979 and is one of the oldest computer networks still in use today. It is a distributed system of servers that allow users to communicate with each other in a decentralized manner. Newsgroups are an important part of the USENET network, providing a platform for users to discuss topics of interest and exchange information.