A cholangiogram is a medical imaging technique used to visualize the bile ducts within the liver and gallbladder. It involves the injection of a contrast dye into the bile ducts, followed by X-ray imaging to highlight any abnormalities such as blockages, strictures, or tumors. This procedure can be performed during a cholangiography, which is often done alongside other interventions like endoscopic retrograde cholangiopancreatography (ERCP) or percutaneous approaches. It is crucial for diagnosing and managing biliary conditions.