In the past we understood only two types of Diabetes: Insulin Dependent also earlier named as Juvenile Diabetes in Young and Non Insulin Dependent Diabetes in older people. With the alarming rise of diabetes in India and globally, we are now seeing younger and younger diabetic patients, so the question of whether they are Type 1 or Type 2 DM is a challenge to diagnose and requires a good history, proper examination and few investigations. We are also now classifying other types which classically do not fit into these.