Intensity-modulated radiation therapy (IMRT) is an advanced form of radiation therapy used to treat cancer. It allows doctors to deliver precise doses of radiation to tumors while minimizing exposure to surrounding healthy tissues. This is achieved by varying the intensity of the radiation beams, which can be shaped to match the contours of the tumor. IMRT uses sophisticated computer software to create a treatment plan tailored to each patient's specific needs. By adjusting the angles and intensities of the radiation beams, IMRT can effectively target complex tumor shapes, making it a valuable option for treating various types of cancer.