A Foley catheter is a flexible tube inserted into the bladder to drain urine. It is commonly used in medical settings for patients who cannot urinate on their own due to surgery, injury, or certain medical conditions. The catheter is held in place by a small balloon that is inflated once it is in the bladder. Foley catheters come in various sizes and materials, allowing healthcare providers to choose the best option for each patient. They are typically connected to a drainage bag, which collects urine and helps monitor output. Proper care and hygiene are essential to prevent infections associated with catheter use.