External Beam Radiotherapy (EBRT) consists of a beam or multiple beams of radiation that can be used for destroying tumors and surrounding cancer cells. It contains high energy photons that target and destroy the cancer cells. The radiation beams are generated from a machine called a linear accelerator. The linear accelerator generates high-energy X-rays or electrons that destroy the tumor cells without touching the skin of the patient or the tumor tissue. Along with the cancer tissues the beam also destroys the surrounding healthy tissues.