Radiation oncology, also known as radiation therapy, is the medical use of ionizing radiation as a part of cancer treatment to control or kill malignant cells. It is sometimes abbreviated to XRT or DXT. Radiation therapy is useful in treating cancer localized in one area of the body and also in preventing resurgence of tumor after the removal of primary malignant cells. The precise treatment (curative, adjuvant, neoadjuvant) is based on a number of factors such as the patient's health, the type of tumor, location of the tumor, and the stage of the tumor. Radiation oncology also has several applications in non-malignant conditions like thyroid eye disease, pigmented villonodular synovitis, vascular restenosis, and heterotopic ossification. The market of radiation oncology has been driven by increasing prevalence of cancer, fast evolving technology, and more number of students opting to be radiation oncologists, leading to an increase in the options available in the market.