Diabetes is a term used to label what's actually a group of different conditions that result in blood glucose being at dangerously high levels if not controlled.
You can learn more about diabetes at the links below. The links point to pages at Tudiabetes.org, a community of people touched by diabetes, which is run by the Diabetes Hands Foundation:
About Type 1 diabetes:
About Type 2 diabetes:
About other types of diabetes: