What are Usenet headers?

One of the main technologies produced is an XML-based file format called NZB files, which contain a list of MessageIDs that are related to specific items on Usenet. Through the use of these files, Usenet clients are able to directly download material from Usenet without having to pre-fetch the headers for the target group. Thus, the main benefit of the direct link is improving the efficiency of Usenet binaries. It is technologies such as these that are increasing the popularity of Usenet for file-sharing.