Gene therapy involves introducing genetic material into a patient's cells to treat or prevent a disease. It can work by replacing a faulty gene with a healthy one, adding a new gene, or modifying existing genes. This is often achieved using vectors, like modified viruses, which act as carriers to deliver the therapeutic gene to the target cells. Gene therapy has shown promise in treating various conditions, including genetic disorders, cancer, and infectious diseases. Present study focus on introduction and types of gene therapy.