Radiation refers to the use of high-energy waves or particles to diagnose or treat diseases. It is most commonly associated with radiation therapy, a treatment that uses targeted ionizing radiation to destroy cancer cells or shrink tumors while minimizing damage to surrounding healthy tissue. Radiation is also used in diagnostic imaging, such as X-rays and CT scans, to create detailed images of the inside of the body. While radiation can be highly effective, it may cause side effects depending on the dose, duration, and area of exposure. Its use is carefully planned to balance benefits with potential risks.