Radiotherapy, also known as radiation therapy, is a medical treatment that utilizes high doses of radiation to target and destroy abnormal cells in the body. This form of treatment is commonly employed to manage various types of cancers, either as a primary treatment or in combination with other therapeutic approaches. The fundamental principle of radiotherapy lies in its ability to damage the DNA within cells, preventing them from growing and dividing. While normal cells can also be affected, they typically have a greater ability to repair themselves compared to cancerous cells. The goal of radiotherapy is to maximize damage to cancer cells while minimizing harm to surrounding healthy tissues. Patients undergoing radiotherapy may receive treatment externally through machines that direct radiation beams at specific tumor sites, or internally through the placement of radioactive materials near or within the affected area. The treatment plan is carefully customized for each individual, considering factors such as the type of cancer, its location, and the overall health of the patient. Side effects of radiotherapy can occur, as healthy cells may be affected, leading to temporary discomfort in the treated area. However, these side effects are often manageable and tend to subside once the treatment is completed. In summary, radiotherapy is a valuable tool in the fight against cancer, playing a crucial role in reducing or eliminating tumors. Its precise and targeted approach continues to contribute significantly to the overall success of cancer treatment strategies, offering patients a chance for improved outcomes and enhanced quality of life.