Nzb.Su is a platform designed for retrieving posts from Usenet servers using the NZB file format. The NZB format, developed by NewzBin, is an XML-based method that allows users to download files more efficiently by only retrieving the necessary segments. This approach reduces bandwidth usage and speeds up the download process compared to traditional methods. Nzb.Su utilizes this technology to provide quick and efficient access to Usenet content.