Immunotherapy is a revolutionary approach to treating diseases, particularly cancer, by harnessing the body's own immune system. It works by stimulating or enhancing the immune response to identify and destroy tumor cells more effectively. This treatment can take various forms, including monoclonal antibodies, checkpoint inhibitors, and vaccines. Unlike traditional therapies such as chemotherapy, immunotherapy aims to provide a more targeted and lasting defense against cancer, potentially leading to improved outcomes and fewer side effects.