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It involves the use of high-energy radiation, such as X-rays or protons, which are directed at the tumor to destroy the cancer cells and prevent them from spreading. The radiation can be administered externally using machines called linear accelerators, or internally by placing radioactive substances directly into or near the tumor. Radiation therapy is often used in conjunction with other cancer treatments, such as surgery or chemotherapy, to improve the chances of a successful outcome. This Wikipedia page provides detailed information on the various types of radiation therapy, the methods of delivery, the common side effects and complications, as well as the benefits and limitations of the treatment. It also covers the history and development of radiation therapy, along with recent advancements and future prospects in the field.