An insulin pump is a small medical device used by people with diabetes to deliver insulin continuously throughout the day. It is typically worn on the body and connected to a catheter that inserts under the skin. This allows for precise control of insulin levels, helping to manage blood sugar more effectively than traditional methods. The pump can be programmed to release different amounts of insulin based on the user's needs, such as during meals or periods of activity. Many pumps also have features like continuous glucose monitoring to provide real-time data, making it easier for users to maintain stable blood sugar levels.