The improvements in Internet technologies and growing demands on online multimedia businesses have made digital copyrighting as a major challenge for businesses that are associated with online content distribution via diverse business models including pay-per-view, subscription, trading, etc. Copyright protection and the evidence for rightful ownership are major issues associated with the distribution of any digital images. Digital watermarking is a probable solution for digital content owners that offer security to the digital content. In recent years, digital watermarking plays a vital role in providing the apposite solution and numerous researches have been carried out. In this paper, an extensive review of the prevailing literature related to the Bio- watermarking is presented together with classification by utilizing an assortment of techniques. In addition, a terse introduction about the Digital Watermarking is presented to get acquainted with the vital information on the subject of Digital Watermarking.