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Usenet is a public discussion system which was developed to facilitate communication on the World Wide Web (WWW). Users from all over the world take part in the discussions to express their views on variety of topics and issues. Conceived by the students of the Duke University Tom Truscott and Jim Ellis in 1979, the Usenet looks like the bulletin boards and web forums. However the concept of Usenet is entirely different from these two even if the ultimate objective is same, i.e. to take part in online discussions or to broadcast certain information. The main difference between the Usenet and the Bulletin Board Systems (BBS) is that like the BBS the Usenet is not based on a central server and there is no central system owner, rather it is distributed among a large conglomeration of servers which change continuously and store and forward the Usenet messages to each other. Generally these servers operate in a loosely formed variable mesh topology.

Users of the Usenet generally read and post the messages on the local server operated by their ISP, University or by their employer. These messages are then exchanged among other servers online so that the information is available globally. The messages which the users read from or post to the Usenet are known as articles, posts, discussions or more popularly as news which are organized into different categories known as newsgroups. All the discussions are threaded with the help of news reader software. In order to use the Usenet the individuals have to subscribe themselves. Once they are logged into the user network (Usenet) the news client software application keeps track of all the activities of the users, activities like which articles they have read, the replies they have made or any new discussion initiated by them.

Generally, most of the discussions in a newsgroup are replies of some on going topics, i.e. one article is the reply of the other article. The set of articles which can be traced to one single no reply article is considered as a separate thread. Modern newsreaders display the discussions in the form of threads and sub-threads. This is very useful in case the users want to identify and follow a particular discussion in a high volume newsgroup.

Whenever a user starts a new discussion or replies to a post in a newsgroup it is available only for the users of that news server initially and then the different Usenet servers talk to each other periodically as per their configuration to copy the postings among each other and make them accessible on every network.

Usenet has its own cultural importance on the internet. It has given birth to many categories and sub-cultures and has offered millions of users an opportunity to express themselves, share their views on critical topics, help each other by giving suggestions and make friends. The messages or articles in a Usenet are transmitted in the same way the e-mails are sent. The only difference between the two is that the e-mails are restricted to their recipients but the Usenet users can access any information anytime.