Catheterization is a medical procedure that involves inserting a thin tube, called a catheter, into a body cavity or vessel. This is often done to drain fluids, deliver medications, or perform diagnostic tests. Catheterization can be performed in various settings, including hospitals and outpatient clinics, and is commonly used in procedures related to the urinary system and cardiovascular system. There are different types of catheters, such as urinary catheters for bladder drainage and cardiac catheters for examining heart function. The procedure is typically performed by trained healthcare professionals, ensuring that it is done safely and with minimal discomfort to the patient. Proper hygiene and technique are essential to prevent infections and complications.