A urinary catheter is a thin tube inserted into the bladder to drain urine. Catheters are used for a variety of medical reasons, including bladder management for urinary incontinence, bladder drainage for urinary retention, and during surgical procedures or medical tests. There are several types of catheters, including: 

• Intermittent catheter: This type of catheter is inserted into the bladder periodically, typically several times a day, to drain urine. 
• Indwelling catheter: This type of catheter remains in the bladder for an extended period of time, usually several days to several weeks. 
• Suprapubic catheter: This type of catheter is inserted through the abdomen into the bladder and is used when an indwelling catheter is not feasible. 
• External catheter: This type of catheter is worn on the outside of the body and is attached to a collecting bag. 

It is important to follow the instructions of a healthcare professional and the manufacturer’s instructions for proper insertion, care, and maintenance of urinary catheters to reduce the risk of infection and other complications.