In many ways, Usenet servers are similar to a standard Internet message board. Users can get together and discuss a wide variety of topics and share information. Usenet servers are also a popular way to share files from user to user. A Usenet server works separately from standard Internet access - oftentimes separate levels of access are needed to connect to a Usenet group. Many are not available to standard Internet users - you need to sign up to receive access.
Many companies that provide internet service also offer separate access to their users for Usenet servers. In the nascent days of the Internet, Compuserve was a popular provider of Usenet access. These servers are located separately from the standard internet. Though the Internet generally allows for users to accomplish many of the same goals they would get from a Usenet servers, many still prefer the latter. A Usenet server can be a more personable experience as well as a safer one - the same information can generally be accessed without the risk of spyware, adware or viruses.
Computer programs that allow users to connect to Usenet servers are called "newsreader clients." There is a newsreader client available for any operating system available. Microsoft's Outlook Express also allows users the option to connect to various Usenet servers. These clients are ideal for managing multiple Usenet servers simultaneously and keeping track of updates across all of them. Clients are also necessary for downloading files that users attach to messages on these servers.