The type of radiation used to treat cancer is known as ionizing radiation. This radiation is capable of destroying or damaging the DNA of cancer cells, thereby inhibiting their ability to proliferate and survive. Different forms of ionizing radiation, such as X-rays and gamma rays, are commonly used in therapeutic applications to target tumors while minimizing damage to surrounding healthy tissues. Radiation therapy can be a standalone treatment or combined with other modalities like surgery and chemotherapy. Its effectiveness and precision in cancer treatment continue to evolve with advances in medical technology.