The trademark has changed hands many times over the decades. URL Uniform Resource Locator. Provides the exact location of a resource on the internet, and describes the type of resource. It has since grown to include over 10,000 separate newsgroups about many different topics. In an unmoderated newsgroup, anyone can place messages, and anyone can read them.
Most messages are replies to other messages, and thus an endless discussion is formed.
Posting to a newsgroup is not unlike writing email. The Internet is the main medium for the distribution of Usenet News, but it wasn't always so. UUCP used to be the most common way to transfer Usenet, and it is still in use today. Getting a Usenet feed is as simple as asking an existing Usenet site. Any site can feed or be fed by any other site, and thus it is practically impossible to control.