Immunotherapy has revolutionized cancer treatment by providing new avenues to combat the disease. Unlike traditional treatments like chemotherapy and radiation, which target cancer cells directly, immunotherapy boosts the body's own immune system to recognize and destroy cancer cells. This approach has shown remarkable success in treating various types of cancer, including melanoma, lung cancer, and certain types of leukemia. Immune checkpoint inhibitors and CAR-T cell therapy are among the most notable immunotherapies.