When you eat, your food is broken down into a sugar called glucose.  Glucose gives your body the energy it needs to work.  But to use glucose as energy, your body needs insulin.  When you have diabetes, your body does not make enough insulin or does not use it well.  Since your body's cells can't use the glucose from your food as energy, the glucose stays in your blood where it can cause serious problems.

There is no cure for diabetes, but it can be managed.  Balancing the food you eat with exercise and medicine (if prescribed) can keep your blood glucose in a healthy range.  It is very important to take this disease seriously and it is up to you to do the day-to-day things to keep yourself healthy even with diabetes
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These pages help distiguish the difference between Type 1, Type 2, and Pre-diabetes.