Angiography is a medical imaging technique used to visualize the inside of blood vessels and organs. It involves injecting a special dye, called a contrast agent, into the bloodstream. This dye makes the blood vessels visible on X-ray images, helping doctors identify blockages, abnormalities, or other issues in the cardiovascular system. The procedure is often performed in a hospital or specialized clinic. After the dye is injected, a series of X-ray images are taken to capture detailed views of the blood vessels. Angiography is commonly used to diagnose conditions like heart disease or stroke, guiding treatment decisions for better patient outcomes.