Synthetic viruses are artificially created viruses designed for research and therapeutic purposes. Scientists can engineer these viruses to study how they infect cells, understand viral behavior, and develop vaccines. By manipulating their genetic material, researchers can create models that mimic natural viruses, allowing for safer experimentation. These synthetic viruses can also be used in gene therapy, where they deliver therapeutic genes to treat diseases. For example, they can be modified to target specific cells, helping to combat conditions like cancer. This innovative approach holds promise for advancing medical treatments and improving our understanding of viral infections.