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 glucose levels in real-time. Users can scan the sensor with the reader or app to get a glucose reading without the need for fingerstick tests. The FreeStyle Libre provides insights into glucose trends and patterns, helping individuals manage their diabetes more effectively and make informed decisions about their diet and insulin use.