Radiation therapy is a medical treatment that uses high doses of radiation to kill or damage cancer cells. It works by targeting the DNA of these cells, making it difficult for them to grow and divide. This therapy can be used alone or in combination with other treatments, such as surgery or chemotherapy, to improve outcomes for patients. The treatment is typically delivered in a series of sessions, often using a machine called a linear accelerator. While radiation therapy can be effective, it may also cause side effects, such as fatigue or skin irritation, depending on the area being treated.