Glucose comes from the food you eat and moves through your bloodstream to help fuel your body. Meanwhile, insulin is a hormone that helps regulate how sugar is used as energy or stored for later.

Both work together to balance blood sugar levels, keeping them in the range that your body requires. This natural process doesn’t work the same way in people with diabetes and glucose-related disorders, but the same concept applies even to those who must manually manage their blood sugar levels.”

Healthline (Insulin and Glucagon: How Do They Work?)