https://www.researchgate.net/publication/323695052_Introduction_to_Gene_Expression_of_Viruses This research article is comprising of the introduction to the gene expression of viruses, the classification of viruses, propagation methods, their forms, presentation of groups of viruses, genetic composition and gene expression steps. The study of gene expression and its regulation in viruses is very complex. Through this mini review, the research data of the last decades has been collected as an introduction to this science (cellular biology) and the basic organs have been identified in it but in different ways and theories which also have led to a study steps to get started, elongation and termination. Synthesizing the protein using bacterial as well as industrial extracts, or genomes of RNA identify the most important contributing proteins and participate in those steps. In order to obtain mRNA from the cell, it is very important to study the bio-protein in both Eukaryotes and eukaryotes groups. Many protein factors have been identified and detected, particularly, those that contribute to protein synthesis and development processes. With the scientific development in recent years, the sequence of a large number of viral genomes has been identified and investigated. The recognition of mRNA functions and their fundamental role constituted a major revolution in the knowledge of gene expression mechanisms in viruses. Keeping in view the general role of mRNA and its critical importance in promoting protein synthesis, several Arabic and English references have been presented and reviewed in this article. A variety of strategies which characterize viruses and gene expression in host cells have been highlighted. Moreover, ways to synthesize viral proteins have also been presented. The most complex interactions that occur in a balanced way between translation mechanisms in the host cell have been discussed. Additionally, viral mRNA and resulting viral proteins of the viral genome expression have been described. However, some of the knowledge would might be missing due to inaccessibility. There is need to keep a pace with research and exploratory developments in various aspects of cell recognition and viruses and the relationships between them.