Developed by Newsbin, an NZB is an XML file format containing a full list of message IDs for the binary content you want to transfer on Usenet. Simply put, an NZB file serves as a table of contents of Usenet articles to download for your NZB client or newsreader.
Because each binary file is broken up into smaller compressed files (usually RAR format) along with PAR parity files to to repair any missing parts after download, these smaller parts are spread across many Usenet messages or articles to make it possible to store the entire file on the Usenet. An NZB points to all the parts that make up the file you want, making it the easiest and fastest way to download binary content from the Usenet.
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