Once Usenet became available to the general public in the 1980s, the amount of discussions increased very rapidly. Because of the broad number of topics being discussed, there needed to be some sort of organizational scheme.

Newsgroup hierarchies make it easy to make sense out of all the different options on Usenet. They allow you to narrow down the subject of the newsgroup to the extent that it is generally pretty obvious what posts would be relevant to the topic at hand and which would not.

When you connect to the USENET system, you connect with a news reader. This is a specific piece of software that allows you to hook into what is usually termed the server's news feed. It provides the means by which you download articles, download attachments and by which you upload both of those items, as well.

There are quite a few newsgroups on Usenet where experts routinely post on the topic at hand. By and large, you will find most of these newsgroups within the Big 8, the most established of hierarchies.

Modern computer networking is largely a decentralized affair. For instance, a major outage in one ISP services does not bring down the entire Internet, which is one of the primary strengths of the system.