Diabetes is a metabolic disorder where blood sugar levels are too high due to issues with insulin production or resistance. There are three main types of diabetes: type 1 caused by the body not producing insulin; type 2 where the body does not produce enough insulin or cells are resistant; and gestational diabetes which occurs during pregnancy. Diabetes is managed through lifestyle changes like diet, exercise, and medication or insulin depending on the type. Education is important for effective long-term management of the condition.