Continuous glucose monitoring (CGM) is a method used to track blood sugar levels in real-time. It involves a small sensor placed under the skin that measures glucose levels in the interstitial fluid. This data is sent to a device, allowing users to see their glucose trends throughout the day and night. CGM systems help individuals, especially those with diabetes, manage their condition more effectively. By providing alerts for high or low glucose levels, CGM can assist in making timely decisions about food intake, exercise, and medication, ultimately improving overall health and well-being.