The Baculoviridae family is a group of large, double-stranded DNA viruses that infect insects. Baculoviruses have been extensively studied as biological control agents against insect pests in agriculture, forestry, and urban settings. They have several advantages over chemical insecticides, including specificity, safety, and environmental friendliness. Baculoviruses are also amenable to genetic manipulation, which has led to the development of recombinant baculoviruses for use as vaccines, gene delivery vectors, and bioinsecticides. The paper reviews the biology of insect-pathogenic viruses, specifically members of the Baculoviridae family. It describes the life cycle of the virus and the temporary pattern of gene expression. Additionally, the paper provides information on the deletion of the egt gene, which is traditionally employed to create bioinsecticides based on baculoviruses.