Cancer immunotherapy is an emerging field of cancer treatment that harnesses the power of the immune system to fight cancer cells. Some possible synonyms for this term include immune-based therapy, immunomodulatory therapy, immune checkpoint therapy, and immuno-oncology. These terms all refer to therapies that aim to activate or enhance the immune system's ability to recognize and attack cancer cells. Other potential synonyms for cancer immunotherapy include adoptive T cell therapy, CAR T cell therapy, and tumor-infiltrating lymphocyte therapy, which are specific types of immunotherapies that focus on manipulating T cells to target cancer cells. Regardless of the terminology used, cancer immunotherapy is a promising approach to treating cancer that is being rapidly developed and refined.