Cancer immunotherapy is a type of treatment that helps the body's immune system fight cancer. Unlike traditional treatments like chemotherapy and radiation, which target cancer cells directly, immunotherapy boosts the immune response to recognize and destroy cancer cells more effectively. This approach can involve using substances made by the body or in a lab to enhance the immune system's ability to target tumors. There are several types of cancer immunotherapy, including monoclonal antibodies, checkpoint inhibitors, and CAR T-cell therapy. Each method works differently but aims to improve the immune system's ability to identify and eliminate cancer cells. This innovative treatment has shown promise in various cancers, offering new hope for patients.