A catheter is a thin, flexible tube used in medical procedures to either drain fluids from the body or deliver medications directly into the bloodstream. They can be inserted into various parts of the body, such as the bladder, heart, or veins, depending on the treatment needed. Catheters are commonly used in hospitals for patients who may have difficulty urinating or require intravenous therapy. There are different types of catheters, including urinary catheters, central venous catheters, and arterial catheters. Each type serves a specific purpose and is designed for particular medical conditions. Proper insertion and care of catheters are essential to prevent infections and ensure patient safety.