White papers are documents released by companies, organizations, and government agencies to authoritatively describe products, technologies, and policy. Though a white paper is not necessarily an unbiased report, it will typically provide a more detailed overview than press releases and many other forms of documentation. In addition to providing information, however, white papers are also often used for marketing purposes. As a result, it is not uncommon for different vendors to produce competing white papers on the same topic. There are literally thousands of white papers covering a broad range of topics. Many are available online, especially from corporate and organizational web sites.