Newsgroup hosting services are similar to Web hosting: for those who want to create a private newsgroup to discuss a particular topic, providers listed in this category offer various solutions. Additional services like mailing-list or Web gateways are often available. However, newsgroup hosting is different from creating a newsgroup on Usenet: groups hosted by service providers listed here are not relayed across Usenet, they're only available on the server of the provider.
Any service provider offering private newsgroup hosting, for free or for a fee is welcome here. Note that Usenet access providers do have their own category: Computers/Usenet/Feed Services.