Exchanging articles with other Usenet servers. This is how Usenet servers spread articles from server to server. The more peers a Usenet server has, the greater chance the newsgroups within will contain an article posted to that newsgroup. Newsgroups are usually hosted by several organizations and institutions that may or may not be tied in all together, or only have certain amount of "peers" that it relays information to and from. The greater number of peers result in more information per newsgroup as it is synced with other organizations and institutions that relay relative information per group.