Virus is a general term for a group of tiny organisms made up of non-cellular forms of nucleic acid molecules (DNA or RNA) and proteins, living a parasitic life. Viruses are by far the most abundant “life forms” in nature and are the reservoir of most of the genetic diversity in the oceans. They are also the chief culprits of many fatal diseases. The extensive study of viruses as pathogens has yielded detailed knowledge about their biological, genetic, and physical properties. Viruses exhibit exceptional stability and biocompatibility. They have attracted much attention due to the advantages of nanometer-scale size (20-200 nm), a high degree of symmetry and polyvalence, and the relative ease of producing large quantities.