A coronary angiogram uses X-rays and dye to examine heart arteries for diagnosing and treating artery disease. It involves a catheter insertion, dye injection, X-ray imaging, and can show blockages, heart muscle strength, valve function. It's done for angina, unexplained chest pain, vessel issues, congenital heart defects, or abnormal test results. Treatment may include angioplasty, stenting, or coronary artery bypass grafting.