Viral vectors are modified viruses that can carry and deliver genes into target cells and animals. During the virus packaging process, the desired genetic material is inserted into the viral vector, which is then propagated in host cells to produce a high quantity of the modified virus. The resulting viral particles can then be used to deliver the genetic material into specific cells or tissues for various purposes, such as gene therapy or genetic engineering.

Virus packaging plays a crucial role in gene delivery as it allows researchers to use viruses as vehicles to introduce specific genes into cells and tissues, thereby manipulating their genetic makeup or function. This technique has significant applications in biomedical research, including the development of therapeutic treatments for genetic disorders and the study of cellular processes and disease mechanisms.