Diabetes is a chronic metabolic disorder that affects millions of people worldwide. It occurs when the body either doesn’t produce enough insulin or cannot effectively use the insulin it produces. Insulin is a hormone made by the pancreas that allows the body to use sugar (glucose) from carbohydrates in food for energy or to store glucose for future use. Without proper insulin function, blood glucose levels become too high, leading to various health complications. This article explores the types, causes, symptoms, diagnosis, treatment, complications, and prevention of diabetes.