A newsgroup can be thought of as very similar to a discussion forum found online though it is a much older format with, somewhat paradoxically, features that make it more powerful and user-friendly. There are thousands of newsgroups in existence and they cover a broad range of topics.
They are arranged in a hierarchical order which allows users to essentially narrow down their choices of subscriptions to those which meet their specific needs. These groups are hosted on a separate protocol from most Internet traffic and require some specialized software to use. This software is very easy to learn.
A newsgroups similarity to a discussion forum begins with it being focused on a specific topic, with it having many users who are all allowed to post and with it having many different articles and discussions from which the user may choose.
The similarity ends with the fact that newsgroups can also be used for file-sharing and the fact that they are one of the most efficient ways to accomplish the sharing of files online. Compared to other methods, newsgroups are very bandwidth-efficient and a variety of technologies help users ensure the quality and safety of their downloads.
One can find newsgroups by learning the various abbreviations that denote their content. Some of the most popular categories are "comp" for computer; "sci" for science and "rec" for recreation. A newsgroup's name will generally be something along the lines of rec.surfing.ca for a group that covered surfing in California.
There are numerous categories from which one may choose. One of the best features of these online forums is that, quite often, their posters are very accomplished individuals. For example, if one subscribed to a physics-oriented group there is a good chance they'd be chatting with actual physicists via the forums. The conversations are usually very much above the standards found on most online forums.
Newsgroups have a feature which allows them to be used for file-sharing. While this was not their original purpose, they are a very efficient means of doing this. Groups which center around file sharing will have the word "binary" in their name. For example, a group that shared videos of hiking through the Rocky Mountains might be titled rec.binaries.videos.rockies, or something similar. The method by which newsgroups encourage file sharing is vastly different from more commonly-used methods and more reliable.
On newsgroups, one user can upload a file which can, in turn, be downloaded by an unlimited amount of other users. The manner by which newsgroup posts are propagated involves several different servers which means that each user is only downloading from their own server. This avoids the bandwidth demand being focused on one server and increases speed when downloading large files. Unlike other file-sharing systems, users are encouraged to "leech" on a newsgroup. It's perfectly acceptable to download files and not re-upload the same content. In fact, due to the server arrangements, it greatly reduces the bandwidth demands to do it in this fashion.
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