Contrast media are substances used in medical imaging to enhance the visibility of internal structures in the body. They help improve the clarity of images obtained through techniques like X-rays, CT scans, and MRI. By highlighting specific areas, contrast media allow healthcare professionals to better diagnose conditions and assess the health of organs and tissues. These substances can be administered orally or through injection, depending on the type of imaging required. Common types of contrast media include iodine-based solutions for X-rays and CT scans, and gadolinium for MRI. While generally safe, some patients may experience allergic reactions or side effects.