The FreeStyle Libre is a continuous glucose monitoring system designed for people with diabetes. It consists of a small sensor that is worn on the skin, typically on the back of the upper arm. This sensor measures glucose levels in the interstitial fluid and transmits the data to a handheld reader or a smartphone app, allowing users to track their blood sugar levels easily. Users can scan the sensor with the reader or app to get real-time glucose readings, trends, and patterns. The FreeStyle Libre system helps individuals manage their diabetes more effectively by providing insights into how food, activity, and medication affect their glucose levels.